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U.S. swimmer Michael Phelps, the most decorated Olympian of all time, gestures after winning the 200-meter butterfly on Tuesday, August 9. It was the 20th gold medal of his Olympic career. Later in the night, Phelps won his 21st gold -- and his 25th medal in all -- after swimming the anchor leg in the 4x200 freestyle. ODD ANDERSEN/AFP/Getty Images
Phelps' win in the 200-meter butterfly avenged one of the few losses of his Olympic career -- a second-place finish to South Africa's Chad Le Clos in 2012. Le Clos finished fourth in Tuesday's race. Phil Walter/Getty Images
American Katie Ledecky smiles after winning the 200-meter freestyle. It is her second gold in the Rio Games. She also won the 400-meter freestyle. Martin Meissner/AP
Ukrainian tennis player Elina Svitolina reacts after her third-round victory over top-ranked Serena Williams. Svitolina won 6-4, 6-3. Clive Brunskill/Getty Images
Williams won gold in singles and doubles in the 2012 Olympics. But she is already out of both tournaments in Rio de Janeiro. Cameron Spencer/Getty Images
U.S. gymnasts -- from left, Gabby Douglas, Madison Kocian, Simone Biles, Aly Raisman and Laurie Hernandez -- celebrate after winning the team all-around. The United States also won gold in 2012. Ben Stansall/AFP/Getty Images
Brazilian basketball player Marcus Marquinhos, in green under the basket, tips in the winning basket to upset Spain 66-65. Alex Livesey/Getty Images
Synchronized divers Chen Ruolin and Liu Huixia won the 10-meter platform event for China. Matt Dunham/AP
The diving pool, right, had turned from blue to green since Monday. The cause is still under investigation, but water tests showed there were no health risks, Rio organizers said. Adam Pretty/Getty Images
Egyptian beach volleyball players Doaa Elghobashy and Nada Meawad, left, switch sides with Italy's Marta Menegatti and Laura Giombini. Yashuyoshi Chiba/AFP/Getty Images
Kosovo's Majlinda Kelmendi, right, defeated Italy's Odette Giuffrida in the 52-kilogram (115-pound) judo final. It is the first Olympic medal in Kosovo history. NurPhoto/Getty Images
Japanese rugby player Katsuyuki Sakai scores a try against Great Britain. David Rogers/Getty Images
Brazilian rider Ruy Fonseca, on Tom Bombadill Too, hits an obstacle during the jumping round of the team eventing final. Stephen McCarthy/Sportsfile/Getty Images
Australia's Rowie Webster, right, mugs Russia's Anna Timofeeva during a water polo match. AAron Ontiveroz/Denver Post/Getty Images
Japanese canoeist Takuya Haneda is congratulated after a ride in the C-1 slalom final. He won the bronze medal. Olivier Morin/AFP/Getty Images
Germany's Sideris Tasiadis competes in the C-1 slalom. Carl de Souza/AFP/Getty Images
Mexico's Jorge Alejandro Barajas serves the ball during a volleyball match against France. Antonin Thuillier/AFP/Getty Images
Italy's volleyball team is introduced before its match against the United States. Buda Mendes/Getty Images
Iran's Zahra Nemati shoots an arrow during the women's individual archery competition. Jewel Samad/AFP/Getty Images
Hungarian fencer Geza Imre, left, competes against France's Gauthier Grumier during an epee semifinal. Imre won 15-13 to advance to the final, which he lost to South Korea's
Park Sang-young. Fabrice Coffrini/AFP/Getty Images
Park Sang-young. Fabrice Coffrini/AFP/Getty Images
Moldovan weightlifter Serghei Cechir celebrates after finishing in first place in the 69-kilogram (152-pound) weight class. He lifted 144 kilograms (317.5 pounds) in the snatch and 178 kilograms (392.4 pounds) in the clean and jerk for a combined 322 kilograms (709.9 pounds). Julian Finney/Getty Images
The Ivory Coast's Thibault Amani Danho competes in the 100-meter freestyle. GABRIEL BOUYS/AFP/Getty Images
Mexico's Misael Uziel Rodriguez, left, takes a battering from Iraq's Waheed Abdulridha Waheed Karaawi during a middleweight boxing match. Rodriguez won the match, however, and advanced. Frank Franklin II/AP
Track cyclists from Great Britain put their heads down during a training session inside the Olympic Velodrome. Patrick Semansky/AP
Zimbabwe's Sean Michael Gunn dives in for a 100-meter freestyle race. Morry Gash/AP
South Korean archer Chang Hye-jin takes part in the women's individual competition. Earlier this week, she and teammates Choi Mi-sun and Ki Bo-bae took gold in the team event. JEWEL SAMAD/AFP/Getty Images
Volleyball player Demian Gonzalez is embraced by Argentina fans after his team beat Russia in a preliminary round. They will next face Poland on Thursday. Buda Mendes/Getty Images
