Rio Games: Athletes on Day 1

South Korea's Kim Woo-jin releases the arrow during the men's team archery competition at the Sambadrome venue during the 2016 Summer Olympics in Rio de Janeiro, Brazil, Aug. 6, 2016.

Japan players follow the game during men's water polo preliminary round match against Greece at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Aug. 6, 2016.

Spencer Turrin and Alexander Lloyd, of Australia, compete in a men's pair heat in Lagoa during the 2016 Summer Olympics in Rio de Janeiro, Brazil, Aug. 6, 2016.

Judges watch Germany's Andreas Bretschneider perform his floor routine during the artistic gymnastics men's qualification at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Aug. 6, 2016.

Germany's Andreas Toba reacts after falling while performing his floor routine during the artistic gymnastics men's qualification at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Aug. 6, 2016.

France's Caroline Ladagnous, scores a try during the women's rugby sevens match between France and Spain at the Summer Olympics in Rio de Janeiro, Brazil, Aug. 6, 2016.

Timea Bacsinszky, of Switzerland, returns to Zhang Shuai, of China, during the 2016 Summer Olympics in Rio de Janeiro, Brazil, Aug. 6, 2016.

Canada's Mo Zhang returns a shot to Hana Matelova, of the Czech Republic, during their table tennis match at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Aug. 6, 2016.

Cameroon's Stephanie Fotso Mogoung bumps during a women's preliminary volleyball match against Brazil at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Aug. 6, 2016.

Brazil's Sarah Menezes, white, competes against Belgium's Charline Van Snick during the women's 48-kg judo competition at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Aug. 6, 2016.

Britain's Adam Peaty goes on to break the world record in a heat of the men's 100-meter breaststroke during the swimming competitions at the 2016 Summer Olympics, in Rio de Janeiro, Brazil, Aug. 6, 2016.