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Usain Bolt of Jamaica poses as a cameraman on a segway rides past after winning the men's 100m final during the 15th IAAF World Championships at the National Stadium in Beijing, China in this August 23, 2015 file photo. Bolt collided with the same cameraman after winning the men's 200m final on August 27, 2015. (Photo by Lucy Nicholson/Reuters)

Usain Bolt of Jamaica poses as a cameraman on a segway rides past after winning the men's 100m final during the 15th IAAF World Championships at the National Stadium in Beijing, China in this August 23, 2015 file photo. Bolt collided with the same cameraman after winning the men's 200m final on August 27, 2015. (Photo by Lucy Nicholson/Reuters)




A TV cameraman drives into Usain Bolt of Jamaica after the men's 200m final during the Beijing 2015 IAAF World Championships at the National Stadium, also known as Bird's Nest, in Beijing, China, 27 August 2015. Bolt won the race. (Photo by Rolex Dela Pena/EPA)

A TV cameraman drives into Usain Bolt of Jamaica after the men's 200m final during the Beijing 2015 IAAF World Championships at the National Stadium, also known as Bird's Nest, in Beijing, China, 27 August 2015. Bolt won the race. (Photo by Rolex Dela Pena/EPA)




Usian Bolt of Jamaica is hit by a cameraman on a Segway as he celebrates after winning the men's 200 metres final at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Reuters/Stringer)

Usian Bolt of Jamaica is hit by a cameraman on a Segway as he celebrates after winning the men's 200 metres final at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Reuters/Stringer)




Usain Bolt of Jamaica (R) falls after being hit by a cameraman (C) on a Segway as he celebrates after winning the men's 200 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Reuters/Stringer)

Usain Bolt of Jamaica (R) falls after being hit by a cameraman (C) on a Segway as he celebrates after winning the men's 200 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Reuters/Stringer)




Usain Bolt of Jamaica (R) falls after being knocked over by a cameraman (C) on a Segway as he celebrates after winning the men's 200 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Reuters/Stringer)

Usain Bolt of Jamaica (R) falls after being knocked over by a cameraman (C) on a Segway as he celebrates after winning the men's 200 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Reuters/Stringer)




Usain Bolt of Jamaica (R) gets up after being knocked over by a cameraman (L) on a Segway as he celebrates after winning the men's 200 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Reuters/Stringer)

Usain Bolt of Jamaica (R) gets up after being knocked over by a cameraman (L) on a Segway as he celebrates after winning the men's 200 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Reuters/Stringer)




Usain Bolt of Jamaica (2nd L) rubs his feet after being hit by a cameraman (R) on a Segway after winning the men's 200 metres final at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Reuters/Stringer)

Usain Bolt of Jamaica (2nd L) rubs his feet after being hit by a cameraman (R) on a Segway after winning the men's 200 metres final at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Reuters/Stringer)




Usain Bolt of Jamaica (front R) limps after being knocked over by a cameraman (R) on a Segway after winning the men's 200 metres final at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Reuters/Stringer)

Usain Bolt of Jamaica (front R) limps after being knocked over by a cameraman (R) on a Segway after winning the men's 200 metres final at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Reuters/Stringer)




Blanka Vlasic of Croatia competes in the women's high jump qualifying round with the "Bird's Nest" stadium reflected in her sunglasses during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by David Gray/Reuters)

Blanka Vlasic of Croatia competes in the women's high jump qualifying round with the "Bird's Nest" stadium reflected in her sunglasses during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by David Gray/Reuters)




Nicole Tully of the U.S. falls after finishing the women's 5,000 metres heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by David Gray/Reuters)

Nicole Tully of the U.S. falls after finishing the women's 5,000 metres heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by David Gray/Reuters)




Nicole Tully of the U.S. falls after finishing the women's 5,000 metres heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Lucy Nicholson/Reuters)

Nicole Tully of the U.S. falls after finishing the women's 5,000 metres heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Lucy Nicholson/Reuters)




Blanka Vlasic of Croatia competes competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)

Blanka Vlasic of Croatia competes competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)




Airine Palsyte of Lithuania competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Airine Palsyte of Lithuania competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)




Marie-Laurence Jungfleisch of Germany competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Marie-Laurence Jungfleisch of Germany competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)




Erika Kinsey of Sweden competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by David Gray/Reuters)

Erika Kinsey of Sweden competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by David Gray/Reuters)




Erika Kinsey of Sweden competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Erika Kinsey of Sweden competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)




Anna Chicherova of Russia competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Anna Chicherova of Russia competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)




Blanka Vlasic of Croatia competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Blanka Vlasic of Croatia competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)




An official calls for assistance for Abbey D'gostino of the U.S after the women's 5,000 metres heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by David Gray/Reuters)

An official calls for assistance for Abbey D'gostino of the U.S after the women's 5,000 metres heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by David Gray/Reuters)




Isobel Pooley of Britain competes in the high jump qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Isobel Pooley of Britain competes in the high jump qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)




Maureen Koster of the Netherlands falls during the women's 5,000 metres heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Lucy Nicholson/Reuters)

Maureen Koster of the Netherlands falls during the women's 5,000 metres heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Lucy Nicholson/Reuters)




Maureen Koster of the Netherlands falls during the women's 5,000 metres heats as an official goes to her aid during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Lucy Nicholson/Reuters)

Maureen Koster of the Netherlands falls during the women's 5,000 metres heats as an official goes to her aid during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Lucy Nicholson/Reuters)




Sofie Skoog of Sweden competes in the high jump qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Sofie Skoog of Sweden competes in the high jump qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)




Ruth Beitia of Spain competes in the high jump qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Ruth Beitia of Spain competes in the high jump qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)




Morgan Lake of Britain gestures as she competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by David Gray/Reuters)

Morgan Lake of Britain gestures as she competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by David Gray/Reuters)




Erika Kinsey of Sweden reacts as she competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by David Gray/Reuters)

Erika Kinsey of Sweden reacts as she competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by David Gray/Reuters)




Priscilla Frederick of Antigua & Barbuda competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)

Priscilla Frederick of Antigua & Barbuda competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)




Yuliya Levchenko of Ukraine competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)

Yuliya Levchenko of Ukraine competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)




Erika Kinsey of Sweden competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)

Erika Kinsey of Sweden competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)




Kamila Licwinko of Poland competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)

Kamila Licwinko of Poland competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)




Erica Jarder of Sweden competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Erica Jarder of Sweden competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)




Jasmine Todd of the U.S. competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Jasmine Todd of the U.S. competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)




Aiga Grabuste of Latvia competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Aiga Grabuste of Latvia competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)




Maria del Mar Jover of Spain competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Maria del Mar Jover of Spain competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)




Valentina Liashenko of Georgia competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)

Valentina Liashenko of Georgia competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)




Isabelle Pedersen of Norway reacts after finishing the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by David Gray/Reuters)

Isabelle Pedersen of Norway reacts after finishing the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by David Gray/Reuters)




Piotr Malachowski of Poland reacts as he competes in the men's discus throw qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kai Pfaffenbach/Reuters)

Piotr Malachowski of Poland reacts as he competes in the men's discus throw qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kai Pfaffenbach/Reuters)




Karolina Koleczek of Poland looks at the soreboard after finishing the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Lucy Nicholson/Reuters)

Karolina Koleczek of Poland looks at the soreboard after finishing the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Lucy Nicholson/Reuters)




Maria del Mar Jover of Spain competes  in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)

Maria del Mar Jover of Spain competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)




Julian Wruck of Australia competes in the the men's discus throw qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kai Pfaffenbach/Reuters)

Julian Wruck of Australia competes in the the men's discus throw qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kai Pfaffenbach/Reuters)




Kierre Beckles of Barbados reacts after competing in the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Lucy Nicholson/Reuters)

Kierre Beckles of Barbados reacts after competing in the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Lucy Nicholson/Reuters)




Khaddi Sagnia of Sweden competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)

Khaddi Sagnia of Sweden competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)




Aiga Grabuste of Latvia competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)

Aiga Grabuste of Latvia competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)




Latvia's Aiga Grabuste competes in the qualifying round of the women's long jump athletics event at the 2015 IAAF World Championships at the “Bird's Nest” National Stadium in Beijing on August 27, 2015. (Photo by Adrian Dennis/AFP Photo)

Latvia's Aiga Grabuste competes in the qualifying round of the women's long jump athletics event at the 2015 IAAF World Championships at the “Bird's Nest” National Stadium in Beijing on August 27, 2015. (Photo by Adrian Dennis/AFP Photo)




Darya Klishina of Russia competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Darya Klishina of Russia competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kim Kyung-Hoon/Reuters)




Brianna Rollins of the U.S. (C) and Cindy Ofili of Britain compete in the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Lucy Nicholson/Reuters)

Brianna Rollins of the U.S. (C) and Cindy Ofili of Britain compete in the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Lucy Nicholson/Reuters)




Brianna Rollins of the U.S. reacts after competing in the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Lucy Nicholson/Reuters)

Brianna Rollins of the U.S. reacts after competing in the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Lucy Nicholson/Reuters)




Shara Proctor of Britain competes in the long jump qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)

Shara Proctor of Britain competes in the long jump qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)




Darya Klishina of Russia competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)

Darya Klishina of Russia competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)




Jasmine Todd of the U.S. competes in the long jump qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)

Jasmine Todd of the U.S. competes in the long jump qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)




Jasmine Todd of the U.S. competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)

Jasmine Todd of the U.S. competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)




Darya Klishina of Russia competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)

Darya Klishina of Russia competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)




Katarina Johnson-Thompson of Britain competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)

Katarina Johnson-Thompson of Britain competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Phil Noble/Reuters)




Tiffany Porter of Britain (C) competes in the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Lucy Nicholson/Reuters)

Tiffany Porter of Britain (C) competes in the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Lucy Nicholson/Reuters)




Tiffany Porter of Britain (R) and Caridad Jerez of Spain after competing in the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by David Gray/Reuters)

Tiffany Porter of Britain (R) and Caridad Jerez of Spain after competing in the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by David Gray/Reuters)




Athletes compete in the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Dylan Martinez/Reuters)

Athletes compete in the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Dylan Martinez/Reuters)




Ekaterina Galitskaia of Russia (L), Kendra  Harrison of the U.S. and Isabelle Pedersen of Norway compete in the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Dylan Martinez/Reuters)

Ekaterina Galitskaia of Russia (L), Kendra Harrison of the U.S. and Isabelle Pedersen of Norway compete in the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Dylan Martinez/Reuters)




Cindy Roleder of Germany (R) and Sharika Nelvis of the U.S. compete in the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Dylan Martinez/Reuters)

Cindy Roleder of Germany (R) and Sharika Nelvis of the U.S. compete in the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Dylan Martinez/Reuters)




Tiffany Porter of Britain competes as she goes on to win the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Dylan Martinez/Reuters)

Tiffany Porter of Britain competes as she goes on to win the women's 100 metres hurdles heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Dylan Martinez/Reuters)




Marie-Laurence Jungfleisch of Germany reacts during the women's high jump qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kai Pfaffenbach/Reuters)

Marie-Laurence Jungfleisch of Germany reacts during the women's high jump qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kai Pfaffenbach/Reuters)




Erika Kinsey of Sweden reacts during the women's high jump qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kai Pfaffenbach/Reuters)

Erika Kinsey of Sweden reacts during the women's high jump qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kai Pfaffenbach/Reuters)




Katarina Johnson-Thompson of Britain waits for her turn as she competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kai Pfaffenbach/Reuters)

Katarina Johnson-Thompson of Britain waits for her turn as she competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Kai Pfaffenbach/Reuters)




Brooke Stratton of Australia competes in the women's long jump qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Dylan Martinez/Reuters)

Brooke Stratton of Australia competes in the women's long jump qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Dylan Martinez/Reuters)




Christabel Nettey of Canada competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Dylan Martinez/Reuters)

Christabel Nettey of Canada competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Dylan Martinez/Reuters)




Elena Sokolova of Russia competes in the women's long jump qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Dylan Martinez/Reuters)

Elena Sokolova of Russia competes in the women's long jump qualification event at the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Dylan Martinez/Reuters)




Darya Klishina of Russia competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Dylan Martinez/Reuters)

Darya Klishina of Russia competes in the women's long jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Dylan Martinez/Reuters)




Blanka Vlasic of Croatia competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Pawel Kopczynski/Reuters)

Blanka Vlasic of Croatia competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Pawel Kopczynski/Reuters)




Oksana Okuneva of Ukraine competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Pawel Kopczynski/Reuters)

Oksana Okuneva of Ukraine competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Pawel Kopczynski/Reuters)




Zheng Xingjuan of China competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Pawel Kopczynski/Reuters)

Zheng Xingjuan of China competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Pawel Kopczynski/Reuters)




Morgan Lake of Britain competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Pawel Kopczynski/Reuters)

Morgan Lake of Britain competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Pawel Kopczynski/Reuters)




Valentina Liashenko of Georgia competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Pawel Kopczynski/Reuters)

Valentina Liashenko of Georgia competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Pawel Kopczynski/Reuters)




Eleanor Patterson of Australia competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Pawel Kopczynski/Reuters)

Eleanor Patterson of Australia competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Pawel Kopczynski/Reuters)




Eleriin Haas of Estonia competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Pawel Kopczynski/Reuters)

Eleriin Haas of Estonia competes in the women's high jump qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Pawel Kopczynski/Reuters)




A TV cameraman plays with his Usain Bolt puppet on the finish line during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. Bolt of Jamaica will run in the men's 200 metres final. (Photo by Lucy Nicholson/Reuters)

A TV cameraman plays with his Usain Bolt puppet on the finish line during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. Bolt of Jamaica will run in the men's 200 metres final. (Photo by Lucy Nicholson/Reuters)




Elaine Thompson of Jamaica (R), Candyce McGrone of U.S. (L) compete in the women's 200 metres semi-final during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Damir Sagolj/Reuters)

Elaine Thompson of Jamaica (R), Candyce McGrone of U.S. (L) compete in the women's 200 metres semi-final during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Damir Sagolj/Reuters)




Hyvin Kiyeng Jepkemoi of Kenya, gold medal, (R) and Habiba Ghribi of Tunisia, silver medal pose on the podium after the women's 3000 metres steeplechase event during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Damir Sagolj/Reuters)

Hyvin Kiyeng Jepkemoi of Kenya, gold medal, (R) and Habiba Ghribi of Tunisia, silver medal pose on the podium after the women's 3000 metres steeplechase event during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Damir Sagolj/Reuters)




Allyson Felix of U.S. (L) celebrates winning the race ahead of Shaunae Miller of Bahamas in the women's 400 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Fabrizio Bensch/Reuters)

Allyson Felix of U.S. (L) celebrates winning the race ahead of Shaunae Miller of Bahamas in the women's 400 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Fabrizio Bensch/Reuters)




Allyson Felix of the U.S. (top) looks at Shaunae Miller of Bahamas after winning the women's 400m final during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Fabrizio Bensch/Reuters)

Allyson Felix of the U.S. (top) looks at Shaunae Miller of Bahamas after winning the women's 400m final during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Fabrizio Bensch/Reuters)




Shericka Jackson of Jamaica sits on the track after the women's 400 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Fabrizio Bensch/Reuters)

Shericka Jackson of Jamaica sits on the track after the women's 400 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Fabrizio Bensch/Reuters)




Allyson Felix of the U.S. celebrates with her national flag after winning the women's 400m final during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Fabrizio Bensch/Reuters)

Allyson Felix of the U.S. celebrates with her national flag after winning the women's 400m final during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Fabrizio Bensch/Reuters)




Usain Bolt of Jamaica (L) poses for photographers after winning the men's 200 metres final as Justin Gatlin from the U.S. looks on during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Dylan Martinez/Reuters)

Usain Bolt of Jamaica (L) poses for photographers after winning the men's 200 metres final as Justin Gatlin from the U.S. looks on during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Dylan Martinez/Reuters)




Allyson Felix of U.S. (R) leads the pack to win the women's 400 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Dylan Martinez/Reuters)

Allyson Felix of U.S. (R) leads the pack to win the women's 400 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Dylan Martinez/Reuters)




Allyson Felix of U.S. takes a picture with fans after winning the women's 400 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Damir Sagolj/Reuters)

Allyson Felix of U.S. takes a picture with fans after winning the women's 400 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. (Photo by Damir Sagolj/Reuters)




Usain Bolt of Jamaica shakes hands with fans after winning the men's 200 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Dylan Martinez/Reuters)

Usain Bolt of Jamaica shakes hands with fans after winning the men's 200 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 27, 2015. (Photo by Dylan Martinez/Reuters)
28 Aug 2015 11:05:00