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Security personnel sweep the infield with metal detectors after the morning session on the first day of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Kai Pfaffenbach/Reuters)

Security personnel sweep the infield with metal detectors after the morning session on the first day of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Kai Pfaffenbach/Reuters)




Security personnel sweep the infield with metal detectors after the first morning session and ahead of the opening ceremony during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Kai Pfaffenbach/Reuters)

Security personnel sweep the infield with metal detectors after the first morning session and ahead of the opening ceremony during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Kai Pfaffenbach/Reuters)




Armed paramilitary policemen stand guard near the National Stadium, also known as the Birds' Nest, during the 15th IAAF World Championships in Beijing, China, August 22, 2015. (Photo by Fabrizio Bensch/Reuters)

Armed paramilitary policemen stand guard near the National Stadium, also known as the Birds' Nest, during the 15th IAAF World Championships in Beijing, China, August 22, 2015. (Photo by Fabrizio Bensch/Reuters)




Flags of participating nations are held up during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)

Flags of participating nations are held up during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)




Performers take part in the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)

Performers take part in the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)




The Hong Kong flag is seen during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)

The Hong Kong flag is seen during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)




Flags of participating nations are held up during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)

Flags of participating nations are held up during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)




Performers parade with flags of particpating nations during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Fabrizio Bensch/Reuters)

Performers parade with flags of particpating nations during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Fabrizio Bensch/Reuters)




China's national flag is raised during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Kai Pfaffenbach/Reuters)

China's national flag is raised during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Kai Pfaffenbach/Reuters)




A flag bearer waves during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Damir Sagolj/Reuters)

A flag bearer waves during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Damir Sagolj/Reuters)




Chinese President Xi Jinping applauds during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Damir Sagolj/Reuters)

Chinese President Xi Jinping applauds during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Damir Sagolj/Reuters)




Performers take part in the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)

Performers take part in the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)




Performers participate in the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Fabrizio Bensch/Reuters)

Performers participate in the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Fabrizio Bensch/Reuters)




Performers participate in the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Pawel Kopczynski/Reuters)

Performers participate in the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Pawel Kopczynski/Reuters)




Flags of participating nations are held up during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Lucy Nicholson/Reuters)

Flags of participating nations are held up during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Lucy Nicholson/Reuters)




Performers hold up flags of particpating nations during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Fabrizio Bensch/Reuters)

Performers hold up flags of particpating nations during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Fabrizio Bensch/Reuters)




Performers participate in the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Fabrizio Bensch/Reuters)

Performers participate in the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Fabrizio Bensch/Reuters)




Performers participate in the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Fabrizio Bensch/Reuters)

Performers participate in the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Fabrizio Bensch/Reuters)




Performers dance with dolls of the official mascot during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)

Performers dance with dolls of the official mascot during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)




A choir performs during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Damir Sagolj/Reuters)

A choir performs during the opening ceremony of the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Damir Sagolj/Reuters)




Athletes from Poland pose for a group photo in the Bird's Nest Stadium at the Wold Athletics Championships in Beijing, China, August 21, 2015. (Photo by Pawel Kopczynski/Reuters)

Athletes from Poland pose for a group photo in the Bird's Nest Stadium at the Wold Athletics Championships in Beijing, China, August 21, 2015. (Photo by Pawel Kopczynski/Reuters)




Mo Farah of Great Britain poses for a selfie with a team doctor inside the Bird's Nest Stadium at the Wold Athletics Championships in Beijing, China, August 21, 2015. (Photo by Phil Noble/Reuters)

Mo Farah of Great Britain poses for a selfie with a team doctor inside the Bird's Nest Stadium at the Wold Athletics Championships in Beijing, China, August 21, 2015. (Photo by Phil Noble/Reuters)




Spectators take photos with their mobile phones during the men's marathon at the 15th IAAF World Championships in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)

Spectators take photos with their mobile phones during the men's marathon at the 15th IAAF World Championships in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)




Runners pass under the portrait of China's late Chairman Mao Zedong during the men's marathon at the 15th IAAF World Championships in Beijing, China August 22, 2015. (Photo by Jason Lee/Reuters)

Runners pass under the portrait of China's late Chairman Mao Zedong during the men's marathon at the 15th IAAF World Championships in Beijing, China August 22, 2015. (Photo by Jason Lee/Reuters)




Yemane Tsegay of Ethiopia (L) and Lelisa Desisa of Ethiopia (R) wipes off their perspiration during the men's marathon at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)

Yemane Tsegay of Ethiopia (L) and Lelisa Desisa of Ethiopia (R) wipes off their perspiration during the men's marathon at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)




A mascot of  the 15th IAAF World Championships performs near the tracks at the National Stadium, also known as the Birds' Nest, in Beijing, August 22, 2015. (Photo by Kai Pfaffenbach/Reuters)

A mascot of the 15th IAAF World Championships performs near the tracks at the National Stadium, also known as the Birds' Nest, in Beijing, August 22, 2015. (Photo by Kai Pfaffenbach/Reuters)




Portia Bing of New Zealand (C) and Salcia Slack of Jamaica (2nd R) compete in the 100m hurdles event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Kai Pfaffenbach/Reuters)

Portia Bing of New Zealand (C) and Salcia Slack of Jamaica (2nd R) compete in the 100m hurdles event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Kai Pfaffenbach/Reuters)




Barbara Nwaba of the U.S. reacts after a false start and disqualification in her 100m hurdles event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Kai Pfaffenbach/Reuters)

Barbara Nwaba of the U.S. reacts after a false start and disqualification in her 100m hurdles event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Kai Pfaffenbach/Reuters)




Katarina Johnson-Thompson of Britain looks at the scoreboard after competing in the 100 metres hurdles heats of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)

Katarina Johnson-Thompson of Britain looks at the scoreboard after competing in the 100 metres hurdles heats of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)




Jessica Ennis-Hill of Britain (L) congratulates Nadine Visser of Netherlands for winning 100 metres hurdles heats 4 of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)

Jessica Ennis-Hill of Britain (L) congratulates Nadine Visser of Netherlands for winning 100 metres hurdles heats 4 of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)




Jessiaca Ennis-Hill of Britain and Nadine Visser of the Netherlands (R) compete in the 100m hurdles event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Kai Pfaffenbach/Reuters)

Jessiaca Ennis-Hill of Britain and Nadine Visser of the Netherlands (R) compete in the 100m hurdles event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Kai Pfaffenbach/Reuters)




Gerald Giraldo of Colombia reacts after competing in the men's 3000 metres steeplechase heats at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)

Gerald Giraldo of Colombia reacts after competing in the men's 3000 metres steeplechase heats at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)




Nadine Broersen adjusts her hair before an attempt as she competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Dylan Martinez/Reuters)

Nadine Broersen adjusts her hair before an attempt as she competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Dylan Martinez/Reuters)




Erica Bougard of the U.S. competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Fabrizio Bensch/Reuters)

Erica Bougard of the U.S. competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Fabrizio Bensch/Reuters)




Nadine Broersen competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Fabrizio Bensch/Reuters)

Nadine Broersen competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Fabrizio Bensch/Reuters)




Roberto Alaiz of Spain (C) is helped by staff after retiring injured from the 3,000 metres steeplechase heat 3 during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)

Roberto Alaiz of Spain (C) is helped by staff after retiring injured from the 3,000 metres steeplechase heat 3 during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)




Laura Ikauniece-Admidina of Latvia competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Phil Noble/Reuters)

Laura Ikauniece-Admidina of Latvia competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Phil Noble/Reuters)




Katarina Johnson-Thompson of Britain reacts after an attempt as she competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Dylan Martinez/Reuters)

Katarina Johnson-Thompson of Britain reacts after an attempt as she competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Dylan Martinez/Reuters)




Katarina Johnson-Thompson of Britain is seen after competing in the 100 metres hurdles event of the women's heptathlon at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)

Katarina Johnson-Thompson of Britain is seen after competing in the 100 metres hurdles event of the women's heptathlon at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)




Amela Terzic of Serbia (L) consoles Laura Weightman of Britain (R) after the women's 1500 metres heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)

Amela Terzic of Serbia (L) consoles Laura Weightman of Britain (R) after the women's 1500 metres heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)




Amela Terzic of Serbia (C) consoles Laura Weightman of Britain after the women's 1500 metres heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)

Amela Terzic of Serbia (C) consoles Laura Weightman of Britain after the women's 1500 metres heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)




Jennifer Oeser of Germany competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Phil Noble/Reuters)

Jennifer Oeser of Germany competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Phil Noble/Reuters)




Katarina Johnson-Thompson of Britain competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Fabrizio Bensch/Reuters)

Katarina Johnson-Thompson of Britain competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Fabrizio Bensch/Reuters)




Yorgelis Rodriguez of Cuba competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Fabrizio Bensch/Reuters)

Yorgelis Rodriguez of Cuba competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Fabrizio Bensch/Reuters)




Jessica Ennis-Hill of Britain reacts after a successful attempt as she competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Phil Noble/Reuters)

Jessica Ennis-Hill of Britain reacts after a successful attempt as she competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Phil Noble/Reuters)




Eliska Klucinova of Czech Republic reacts as she competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Dylan Martinez/Reuters)

Eliska Klucinova of Czech Republic reacts as she competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Dylan Martinez/Reuters)




Brianne Theisen Eaton of Canada reacts as she competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Dylan Martinez/Reuters)

Brianne Theisen Eaton of Canada reacts as she competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Dylan Martinez/Reuters)




Erica Bougard of the U.S. waits for an attempt as she competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Kai Pfaffenbach/Reuters)

Erica Bougard of the U.S. waits for an attempt as she competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Kai Pfaffenbach/Reuters)




Jessica Ennis-Hill of Britain competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Phil Noble/Reuters)

Jessica Ennis-Hill of Britain competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Phil Noble/Reuters)




Jessica Ennis-Hill of Britain signs autographs during the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)

Jessica Ennis-Hill of Britain signs autographs during the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)




Katarina Johnson-Thompson of Britain reacts as she competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Dylan Martinez/Reuters)

Katarina Johnson-Thompson of Britain reacts as she competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Dylan Martinez/Reuters)




Jessica Ennis-Hill of Britain competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Dylan Martinez/Reuters)

Jessica Ennis-Hill of Britain competes in the high jump event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Dylan Martinez/Reuters)




Competitors take part in the men's 3000 metres steeplechase heats at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Kai Pfaffenbach/Reuters)

Competitors take part in the men's 3000 metres steeplechase heats at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Kai Pfaffenbach/Reuters)




The opening ceremony of the 15th IAAF World Championships at the National Stadium is shown on a television in a barber's shop in Beijing, China August 22, 2015. (Photo by Kim Kyung-Hoon/Reuters)

The opening ceremony of the 15th IAAF World Championships at the National Stadium is shown on a television in a barber's shop in Beijing, China August 22, 2015. (Photo by Kim Kyung-Hoon/Reuters)




Nadine Visser of Netherlands competes in the shot put event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Phil Noble/Reuters)

Nadine Visser of Netherlands competes in the shot put event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Phil Noble/Reuters)




Erica Bougard of the U.S. competes in the shot put event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Phil Noble/Reuters)

Erica Bougard of the U.S. competes in the shot put event of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Phil Noble/Reuters)




Dovile Dzindzaletaite of Lithuania competes in the women's triple jump qualification during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Phil Noble/Reuters)

Dovile Dzindzaletaite of Lithuania competes in the women's triple jump qualification during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Phil Noble/Reuters)




Kristiina Makela of Finland competes in the women's triple jump qualification during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Damir Sagolj/Reuters)

Kristiina Makela of Finland competes in the women's triple jump qualification during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Damir Sagolj/Reuters)




A China fan cheers on her team at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)

A China fan cheers on her team at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)




China fans cheer on their team at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)

China fans cheer on their team at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)




Usain Bolt of Jamaica (3rd L) gestures before his men's 100 metres heat at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Usain Bolt of Jamaica (3rd L) gestures before his men's 100 metres heat at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Kim Kyung-Hoon/Reuters)




Nadine Broersen of the Netherlands reacts after the 200 metres event of the women's heptathlon at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)

Nadine Broersen of the Netherlands reacts after the 200 metres event of the women's heptathlon at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)




Nadine Broersen of Netherlands reacts after competing in the 200 metres heats of the women's heptathlon  during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)

Nadine Broersen of Netherlands reacts after competing in the 200 metres heats of the women's heptathlon during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)




Katarina Johnson-Thompson of Britain (2nd R) competes in her heat of the 200 metres event of the women's heptathlon at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)

Katarina Johnson-Thompson of Britain (2nd R) competes in her heat of the 200 metres event of the women's heptathlon at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)




Katarina Johnson-Thompson of Britain looks at the scoreboard after her heat of the 200 metres event of the women's heptathlon at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)

Katarina Johnson-Thompson of Britain looks at the scoreboard after her heat of the 200 metres event of the women's heptathlon at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)




Laura Ikauniece-Admidina of Latvia reacts after her heat in the 200 metres event of the women's heptathlon at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)

Laura Ikauniece-Admidina of Latvia reacts after her heat in the 200 metres event of the women's heptathlon at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)




Renaud Lavillenie of France competes in the men's pole vault qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Renaud Lavillenie of France competes in the men's pole vault qualifying round during the 15th IAAF World Championships at the National Stadium in Beijing, China, August 22, 2015. (Photo by Kim Kyung-Hoon/Reuters)




Mo Farah of Britain celebrates winning the men's 10,000 metres final at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)

Mo Farah of Britain celebrates winning the men's 10,000 metres final at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Dylan Martinez/Reuters)




Mo Farah of Britain celebrates winning the men's 10,000 metres final at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)

Mo Farah of Britain celebrates winning the men's 10,000 metres final at the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by David Gray/Reuters)




Mo Farah of Britain reacts after winning the men's 10000m event during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Lucy Nicholson/Reuters)

Mo Farah of Britain reacts after winning the men's 10000m event during the 15th IAAF World Championships at the National Stadium in Beijing, China August 22, 2015. (Photo by Lucy Nicholson/Reuters)




From left, Britain's Katarina Johnson-Thompson, Britain's Jessica Ennis-Hill, United States' Erica Bougard and New Zealand's Portia Bing wait to compete in the women's javelin throw heptathlon at the World Athletics Championships at the Bird's Nest stadium in Beijing, Sunday, August 23, 2015. (Photo by Kin Cheung/AP Photo)

From left, Britain's Katarina Johnson-Thompson, Britain's Jessica Ennis-Hill, United States' Erica Bougard and New Zealand's Portia Bing wait to compete in the women's javelin throw heptathlon at the World Athletics Championships at the Bird's Nest stadium in Beijing, Sunday, August 23, 2015. (Photo by Kin Cheung/AP Photo)




Britain's Jessica Ennis-Hill lies in the sand as she competes in the women's long jump heptathlon at the World Athletics Championships at the Bird's Nest stadium in Beijing, Sunday, August 23, 2015. (Photo by Wong Maye-E/AP Photo)

Britain's Jessica Ennis-Hill lies in the sand as she competes in the women's long jump heptathlon at the World Athletics Championships at the Bird's Nest stadium in Beijing, Sunday, August 23, 2015. (Photo by Wong Maye-E/AP Photo)




Britain's Katarina Johnson-Thompson, left, disputes the foul jump she was given with officials, as she competes in the women's long jump heptathlon at the World Athletics Championships at the Bird's Nest stadium in Beijing, Sunday, August 23, 2015. (Photo by Lee Jin-man/AP Photo)

Britain's Katarina Johnson-Thompson, left, disputes the foul jump she was given with officials, as she competes in the women's long jump heptathlon at the World Athletics Championships at the Bird's Nest stadium in Beijing, Sunday, August 23, 2015. (Photo by Lee Jin-man/AP Photo)
23 Aug 2015 09:41:00