Jamaica's Usain Bolt, center, competes in the men's 4x100-meter relay final during the athletics competitions of the 2016 Summer Olympics at the Olympic stadium in Rio de Janeiro, Brazil, on Friday. Jamaica won the gold.

United States's Tori Bowie, right, competes in the women's 4x100-meter relay final during the athletics competitions of the 2016 Summer Olympics at the Olympic stadium in Rio de Janeiro, Brazil, on Friday, when the women kept their title.

United States' KK Clark of the women's water polo team celebrates after winning the gold medal match against Italy at the 2016 Summer Olympics in Rio de Janeiro, Brazil, on Friday.

United States' Kami Craig takes a shot as Italy's Federica Radicchi defends during women's gold medal water polo match.

Canada's Diana Matheson, center, takes a selfie with fans after winning the bronze medal in the women's Olympic soccer tournament at the Arena Corinthians stadium in Sao Paulo Friday.

Ilke Ozyusel of Turkey falls during the equestrian portion of the women's modern pentathlon at the Summer Olympics in Rio de Janeiro, Brazil, on Friday.

United States' Kawika Shoji (7) reacts after losing a men's semifinal volleyball match against Italy.

Fans watch during the men's wrestling freestyle 74-kg competition at the 2016 Summer Olympics in Rio de Janeiro, Brazil, on Friday. Iran's Hassan Yazdani scored a takedown in the final 10 seconds to win the gold medal in men's 74-kilogram freestyle wrestling. Yazdani was down 6-2 at one point to Russian Aniuar Geduev, who earlier Friday upset American favorite Jordan Burroughs.

Inbee Park of South Korea attempts to reach the 14th green during the third round of the women's golf event.

China's Fu Haifeng, left, and Zhang Nan celebrate after defeating Malaysia's Goh V Shem and Tan Wee Kiong in the men's badminton doubles gold medal match at the 2016 Summer Olympics in Rio de Janeiro, Brazil, on Friday.

Belarus' Melitina Staniouta performs during the rhythmic gymnastics individual all-around qualifications.

North Korea's Yang Kyong Il, in red, competes against Cuba's Yowlys Bonne Rodriguez during the men's 57-kg freestyle wrestling competition at the 2016 Summer Olympics in Rio de Janeiro, Brazil, on Friday. Georgia wrestler Vladimer Khinchegashvili won the 57-kilogram gold medal.

Gold medalist Connor Fields, right, celebrates with fourth-place finisher Nicholas Long, both of the United States, left, after the men's BMX cycling final.

Germany's Paul Drux tries to score past France's Adrien Dipanda, left, and France's Valentin Porte, right, during the men's semifinal handball match between France and Germany.

Britain's Joe Joyce, top, and Kazakhstan's Ivan Dychko fall during a men's super heavyweight over 91-kg semifinals boxing match.

Cyclists cast shadows as they compete in the men's BMX cycling semifinal during the 2016 Summer Olympics in Rio de Janeiro, Brazil, on Friday. American Connor Fields won the gold.

Japan's Kaho Minagawa performs during the rhythmic gymnastics individual all-around qualifications at the 2016 Summer Olympics in Rio de Janeiro, Brazil, on Friday.

Brazil's Alvaro Doda de Miranda, riding Cornetto K, competes during the equestrian individual jumping competition at the 2016 Summer Olympics in Rio de Janeiro, Brazil, on Friday.