Serena Williams of the United States falls during the match against Australia's Daria Gavrilova in the women's tennis competition at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Sunday, August 7, 2016. (Photo by Vadim Ghirda/AP Photo)





Alessandra Perilli, of San Marino, competes during the trap women's qualification at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Sunday, August 7, 2016. (Photo by Hassan Ammar/AP Photo)





South Korea's Choi Mi-sun celebrates with her teammates during the women's team archery competition at the Sambadrome venue during the 2016 Summer Olympics in Rio de Janeiro, Brazil, Sunday, August 7, 2016. (Photo by Natacha Pisarenko/AP Photo)





Egypt's Mahmoud Abdelaal kisses the matt after winning a match against Algeria's Reda Benbaziz during a men's lightweight 60-kg preliminary boxing match at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Sunday, August 7, 2016. (Photo by Frank Franklin II/AP Photo)





Russia's Yulia Efimova leaves the pool area after competing in a heat of the women's 100-meter breaststroke during the swimming competitions at the 2016 Summer Olympics, Sunday, August 7, 2016, in Rio de Janeiro, Brazil. (Photo by Lee Jin-man/AP Photo)





2016 Rio Olympics, Tennis, Preliminary, Women's Singles First Round, Olympic Tennis Centre, Rio de Janeiro, Brazil on August 6, 2016. Eugenie Bouchard (CAN) of Canada takes a selfie with spectators after winning her match against Sloane Stephens (USA) of USA. (Photo by Toby Melville/Reuters)





2016 Rio Olympics, Hockey, Preliminary, Women's Pool B Britain vs Australia, Olympic Hockey Centre, Rio de Janeiro, Brazil on August 6, 2016. Jane Claxton (AUS) of Australia in action. (Photo by Vasily Fedosenko/Reuters)





2016 Rio Olympics, Artistic Gymnastics, Preliminary, Men's Qualification, Subdivisions, Rio Olympic Arena, Rio de Janeiro, Brazil on August 6, 2016. Oliver Hegi (SUI) of Switzerland competes on the floor. (Photo by Athit Perawongmetha/Reuters)





2016 Rio Olympics, Water Polo, Men's Preliminary Round, Group A Brazil vs Australia, Maria Lenk Aquatics Centre, Rio de Janeiro, Brazil on August 7, 2016. Tattoos of the Joel Swift (AUS) of Australia. (Photo by Laszlo Balogh/Reuters)





2016 Rio Olympics, Volleyball, Women's Preliminary, Pool B Serbia vs Italy, Maracanazinho, Rio de Janeiro, Brazil on August 6, 2016. Paola Egonu (ITA) of Italy serves the ball. (Photo by Marcelo del Pozo/Reuters)





2016 Rio Olympics, Volleyball, Women's Preliminary, Pool B Serbia vs Italy, Maracanazinho, Rio de Janeiro, Brazil on August 6, 2016. (L-R) Monica De Gennaro (ITA) of Italy, Antonella Del Core (ITA) of Italy, Cristina Chirichella (ITA) of Italy, Alessia Orro (ITA) of Italy and Paola Egonu (ITA) of Italy celebrate scoring a point. (Photo by Marcelo del Pozo/Reuters)





2016 Rio Olympics, Volleyball, Women's Preliminary, Pool B Serbia vs Italy, Maracanazinho, Rio de Janeiro, Brazil on August 6, 2016. Brankica Mihajlovic (SRB) of Serbia (L) celebrate a point with Tijana Boskovic (SRB) of Serbia. (Photo by Marcelo del Pozo/Reuters)





2016 Rio Olympics, Soccer, Preliminary, Women's First Round, Group E Brazil vs Sweden, Olympic Stadium, Rio de Janeiro, Brazil on August 6, 2016. Beatriz (BRA) of Brazil celebrates after scoring their fifth goal. (Photo by Gonzalo Fuentes/Reuters)





2016 Rio Olympics, Judo, Preliminary, Women, 52 kg Elimination Rounds, Carioca Arena 2, Rio de Janeiro, Brazil on August 7, 2016. Laura Gomez (ESP) of Spain and Gulbadam Babamuratova (TKM) of Turkmenistan react. (Photo by Toru Hanai/Reuters)





2016 Rio Olympics, Hockey, Preliminary, Women's Pool A New Zealand vs South Korea, Olympic Hockey Centre, Rio de Janeiro, Brazil on August 7, 2016. New Zealand celebrates after Kirsten Pearce (NZL) of New Zealand (R) scores their first goal. (Photo by Vasily Fedosenko/Reuters)





2016 Rio Olympics, Shooting, Preliminary, Women's 10m Air Pistol Qualification, Olympic Shooting Centre, Rio de Janeiro, Brazil on August 7, 2016. The pistol of Teo Shun Xie (SIN) of Singapore is seen during warm-up. (Photo by Jeremy Lee/Reuters)





2016 Rio Olympics, Shooting, Preliminary, Women's 10m Air Pistol Qualification, Olympic Shooting Centre, Rio de Janeiro, Brazil on August 7, 2016. Teo Shun Xie (SIN) of Singapore reacts. (Photo by Jeremy Lee/Reuters)





2016 Rio Olympics, Rugby, Preliminary, Women's Pool C Brazil vs Japan, Deodoro Stadium, Rio de Janeiro, Brazil on August 7, 2016. Haline Leme Scatrut (BRA) of Brazil is tackled by Marie Yamaguchi (JPN) of Japan. (Photo by Phil Noble/Reuters)





2016 Rio Olympics, Basketball, Preliminary, Women's Preliminary Round Group B USA vs Senegal, Youth Arena, Rio de Janeiro, Brazil on August 7, 2016. Elena Delle Donne (USA) of USA adjusts her hair during game. (Photo by Shannon Stapleton/Reuters)





2016 Rio Olympics, Rugby, Preliminary, Women's Pool C Canada vs Britain, Deodoro Stadium, Rio de Janeiro, Brazil on August 7, 2016. Emily Scarratt (GBR) of United Kingdom runs to score. (Photo by Phil Noble/Reuters)





2016 Rio Olympics, Archery, Preliminary, Women's Team 1/8 Eliminations, Sambodromo, Rio de Janeiro, Brazil on August 7, 2016. Carolina Aguirre (COL) of Colombia competes. (Photo by Yves Herman/Reuters)





2016 Rio Olympics, Rugby, Preliminary, Women's Pool C Canada vs Britain, Deodoro Stadium, Rio de Janeiro, Brazil on August 7, 2016. Charity Williams (CAN) of Canada is tackled by Danielle Waterman (GBR) of United Kingdom. (Photo by Alessandro Bianchi/Reuters)





2016 Rio Olympics, Rugby, Preliminary, Women's Pool A Australia vs USA, Deodoro Stadium, Rio de Janeiro, Brazil on August 7, 2016. Emma Tonegato (AUS) of Australia scores as she is tackled by Leyla Alev Kelter (USA) of USA. (Photo by Phil Noble/Reuters)





2016 Rio Olympics, Canoe Slalom, Preliminary, Men's Canoe Single (C1) Heats, Whitewater Stadium, Rio de Janeiro, Brazil on August 7, 2016. Jean Bourhis (SEN) of Senegal competes. (Photo by Ivan Alvarado/Reuters)





2016 Rio Olympics, Basketball, Preliminary, Women's Preliminary Round Group B Serbia vs Spain, Youth Arena, Rio de Janeiro, Brazil on August 7, 2016. Laura Gil (ESP) of Spain (L) and Dajana Butulija (SRB) of Serbia compete. (Photo by Shannon Stapleton/Reuters)





2016 Rio Olympics, Canoe Slalom, Preliminary, Men's Canoe Single (C1) Heats, Whitewater Stadium, Rio de Janeiro, Brazil on August 7, 2016. Pavel Eigel (RUS) of Russia competes. (Photo by Ivan Alvarado/Reuters)





2016 Rio Olympics, Tennis, Preliminary, Women's Doubles First Round, Olympic Tennis Centre, Rio de Janeiro, Brazil on August 7, 2016. Eugenie Bouchard (CAN) of Canada in action during her match with Gabriela Dabrowski (CAN) of Canada against Klaudia Jansignacik (POL) of Poland and Paula Kania (POL) of Poland. (Photo by Kevin Lamarque/Reuters)





2016 Rio Olympics, Diving, Final, Women's Synchronised 3m Springboard, Maria Lenk Aquatics Centre, Rio de Janeiro, Brazil on August 7, 2016. Francesca Dallape (ITA) and Tania Cagnotto (ITA) of Italy embrace. (Photo by Kai Pfaffenbach/Reuters)





2016 Rio Olympics, Rugby, Women's Quarterfinals Britain vs Fiji, Deodoro Stadium, Rio de Janeiro, Brazil on August 7, 2016. Abigail Brown (GBR) of United Kingdom runs in for a try. (Photo by Alessandro Bianchi/Reuters)





Egypt's Sherine Elzeiny waits to perform during the artistic gymnastics women's qualification at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Sunday, August 7, 2016. (Photo by Julio Cortez/AP Photo)





France's Pauline Biscarat, top, jumps over New Zealand's Huriana Manuel, after she scored a try during the women's rugby sevens match at the Summer Olympics in Rio de Janeiro, Brazil, Sunday, August 7, 2016. (Photo by Themba Hadebe/AP Photo)





Yi Mao of China competes on the floor during Women's qualification for Artistic Gymnatics on Day 2 of the Rio 2016 Olympic Games at the Rio Olympic Arena on August 7, 2016 in Rio de Janeiro, Brazil. (Photo by David Ramos/Getty Images)





Petrea Webster of New Zealand Hyoju An of Korea compete for the ball during the women's pool A match between New Zealand and the Republic of Korea on Day 2 of the Rio 2016 Olympic Games at the Olympic Hockey Centre on August 7, 2016 in Rio de Janeiro, Brazil. (Photo by Getty Images/Getty Images)





Manueli Tulo of Fiji competes during the Men's 53kg Group B weightlifting contest on Day 2 of the Rio 2016 Olympic Games at Riocentro - Pavilion 2 on August 7, 2016 in Rio de Janeiro, Brazil. (Photo by Lars Baron/Getty Images)





Ana Maria Rendon of Columbia comptetes during the Women's Team Eliminations match between India and Columbia on Day 2 of the Rio 2016 Olympic Games at the Sambodromo on August 7, 2016 in Rio de Janeiro, Brazil. (Photo by Paul Gilham/Getty Images)





The United States and Senegal line up prior to a Women's Preliminary Round basketball game between the United States and Senegal at Carioca Arena 1 on August 7, 2016 in Rio de Janeiro, Brazil. (Photo by Sean M. Haffey/Getty Images)





Jiaxin Tan of China competes on the uneven bars during Women's qualification for Artistic Gymnatics on Day 2 of the Rio 2016 Olympic Games at the Rio Olympic Arena on August 7, 2016 in Rio de Janeiro, Brazil. (Photo by David Ramos/Getty Images)





A detail view of an athletes ankle with Olympic tatoos during the Women's Team Eliminations on Day 2 of the Rio 2016 Olympic Games at the Sambodromo on August 7, 2016 in Rio de Janeiro, Brazil. (Photo by Paul Gilham/Getty Images)





Aliya Mustafina of Russia competes on the balance beam during Women's qualification for Artistic Gymnatics on Day 2 of the Rio 2016 Olympic Games at the Rio Olympic Arena on August 7, 2016 in Rio de Janeiro, Brazil. (Photo by David Ramos/Getty Images)





Yilin Fan of China competes on the uneven bars during Women's qualification for Artistic Gymnatics on Day 2 of the Rio 2016 Olympic Games at the Rio Olympic Arena on August 7, 2016 in Rio de Janeiro, Brazil. (Photo by David Ramos/Getty Images)





Richard Kruse (R) of Great Britain competes as he defeats Hamid Sintes (L) of Algeria during Men's Individual Foil qualification on Day 2 of the Rio 2016 Olympic Games at Carioca Arena 3 on August 7, 2016 in Rio de Janeiro, Brazil. (Photo by Alex Livesey/Getty Images)





Dustin Brown of Germany hurts his ankle during his match against Thomaz Bellucci of Brazil in their first round match on Day 2 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 7, 2016 in Rio de Janeiro, Brazil. (Photo by Cameron Spencer/Getty Images)





United States' Katie Ledecky, center, competes in the final of the women's 400-meter freestyle during the swimming competitions at the 2016 Summer Olympics, Sunday, August 7, 2016, in Rio de Janeiro, Brazil. (Photo by David J. Phillip/AP Photo)





A plane flys over sailors during a training session on Rio de Janerio's Guanabara Bay for the Rio 2016 Olympic Games on August 6, 2016. (Photo by William West/AFP Photo)





U.S. gymnasts, from left, Aly Raisman, Madison Kocian, Lauren Hernandez and Simone Biles wait for the score during the artistic gymnastics women's qualification at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Sunday, August 7, 2016. (Photo by Julio Cortez/AP Photo)





Unites States' Brooks Sweat, right, and Lauren Fendrick, left, team up to block a shot from Poland's Kinga Kolosinska during a women's beach volleyball match at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Sunday, August 7, 2016. (Photo by Marcio Jose Sanchez/AP Photo)