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USA's Serena Williams reacts after losing a point during her women's third round singles tennis match against Ukraine's Elina Svitolina at the Olympic Tennis Centre of the Rio 2016 Olympic Games in Rio de Janeiro on August 9, 2016.

An overview shows (From L) Lithuania's centre Jonas Valanciunas, Nigeria's power forward Ike Diogu and Lithuania's power forward Paulius Jankunas eye a rebound during a Men's round Group B basketball match between Lithuania and Nigeria at the Carioca Arena 1 in Rio de Janeiro on August 9, 2016 during the Rio 2016 Olympic Games.

Ruby Harold of Great Britain competes on uneven bars during the women's team gymnastics final on Tuesday, August 9, 2016. The United States women won the event.

Simone Biles of the United States caps the gold for her team with her floor routine during the women's team gymnastics final on Tuesday, August 9, 2016. The United States women won the event.

South Korea's Park Sangyoung (R) competes against Switzerland's Benjamin Steffen during their mens individual epee semi-final bout as part of the fencing event of the Rio 2016 Olympic Games, on August 9, 2016, at the Carioca Arena 3, in Rio de Janeiro.

Kelley O聮Hara #5 of the United States is hit in the face with the ball against Lady Andrade #16 of Colombia in the first half of the Women's Football First Round Group G match on Day 4 of the Rio 2016 Olympic Games at Amazonia Arena on August 9, 2016 in Rio de Janeiro, Brazil.

Michael Phelps en route to winning the men's 100-meter butterfly during Rio 2016 action on Tuesday, August 9, 2016. The gold is the 20th for Phelps in his Olympic career.

Algeria's Ilyas Abbadi pauses as he fights Congo's Mpi Anauel Ngamissengue during a men's middleweight 75-kg preliminary boxing match at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Tuesday, Aug. 9, 2016.

Ding'Ning of China plays against Ying'Han of Germany during their table tennis match at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Tuesday, Aug. 9, 2016.

United States' Simone Biles performs on the balance beam during the artistic gymnastics women's team final at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Tuesday, Aug. 9, 2016.

Lauren Hernandez of the United States competes on beam during the women's team gymnastics final on Tuesday, August 9, 2016. The United States women won the event.

Japan's Mai Murakami performs on the beam during the artistic gymnastics women's team final at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Tuesday, Aug. 9, 2016.

United States' Crystal Dunn, top, celebrates scoring her side's first goal with teammate Christen Press during a group G match of the women's Olympic football tournament between Colombia and United States at the Arena Amazonia stadium in Manaus, Brazil, Tuesday, Aug. 9, 2016. The game ended in a 2-2 draw.

Germany's Karin Schnaase stretches during a badminton training session at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Tuesday, Aug. 9, 2016.