Kosuke Hagino of Japan reacts after winning the gold medal in the 400m medley. REUTERS/Marcos Brindicci

Emese Szasz of Hungary (C) celebrates winning the gold medal with Rossella Fiamingo of Italy and Sun Yiwen of China in the epee competition. REUTERS/Issei Kato

Greg Van Avermaet of Belgium celebrates as he crosses the finish in the men's road race. REUTERS/Eric Gaillard

Kei Nishikori of Japan is reflected in a window as he serves against Albert Ramos of Spain. REUTERS/Toby Melville

Adam Peaty of United Kingdom competes in the 100m breaststroke. REUTERS/Michael Dalder

Katinka Hosszu of Hungary celebrates after winning the 400m medley. REUTERS/Stefan Wermuth

Yusra Mardini of the Refugee Olympic Athletes competes in the women's 100m butterfly. REUTERS/Dominic Ebenbichler

Cyclists start the race from Copacabana beach. REUTERS/Eric Gaillard

Katinka Hosszu of Hungary leads on her way to setting a new world record in the 400m individual medley. REUTERS/Michael Dalder

Andreas Toba of Germany is consoled by teammate Lukas Dauser during the men's gymnastics qualifications. REUTERS/Mike Blake

Fernanda Rodrigues of Brazil eyes the ball. REUTERS/Marcelo Del Pozo

Eugenie Bouchard of Canada takes a selfie with spectators after winning her tennis match against Sloane Stephens of USA. REUTERS/Toby Melville

Australia's Emma McKeon, Brittany Elmslie, Bronte Campbell and Cate Campbell celebrate winning the women's 4 x100m freestyle relay REUTERS/Stefan Wermuth

Goalkeeper Konstantinos Flegkas of Greece makes a save during a water polo prelimary round against Japan. REUTERS/Laszlo Balogh

Carmelo Anthony of the USA and team mate Kyrie Irving celebrate. REUTERS/Lucy Nicholson

Mack Horton of Australia poses with his medal for the 400m freestyle. REUTERS/David Gray

Ming Yen Tsai of Taiwan and Soukphaxay Sithisane of Laos compete in the judo elimination rounds. REUTERS/Toru Hanai

Goalkeeper Tess Wester of Netherlands celebrates a save. REUTERS/Marko Djurica

Spectators arrive at Olympic Park. REUTERS/Reinhard Krause

Mack Horton of Australia competes to win gold in the men's 400m freestyle. REUTERS/Michael Dalder

Kohei Uchimura of Japan falls as he competes on the horizontal bar. REUTERS/Dylan Martinez

Oleg Stepko of Azerbaijan competes during the men's qualifications. REUTERS/Dylan Martinez

Fabian Hambuchen of Germany reacts after competing on the horizontal bar. REUTERS/Damir Sagolj

South Korean team volleyball players celebrate defeating Japan. REUTERS/Marcelo Del Pozo

Alex Sobers of Barbados competes in the men's 400m freestyle. REUTERS/Dominic Ebenbichler

Ana Ivanovic of Serbia reacts after losing her match against Carla Suarez Navarro of Spain. REUTERS/Toby Melville

Sun Yiwen of China (L) celebrates after winning the match in the epee individual bronze medal bout. REUTERS/Issei Kato

Katinka Hosszu of Hungary reacts after winning and setting a new world record in the 400m medley. REUTERS/Michael Dalder

Beatriz of Brazil celebrates her goal in the soccer match against Sweden. REUTERS/Gonzalo Fuentes