2016 Rio Olympics - Swimming - Final - Men's 100m Butterfly Final - Olympic Aquatics Stadium - Rio de Janeiro, Brazil - 12/08/2016. Michael Phelps (USA) of USA reacts. REUTERS/Marcos Brindicci

2016 Rio Olympics - Basketball - Preliminary - Men's Preliminary Round Group A USA v Serbia - Carioca Arena 1 - Rio de Janeiro, Brazil - 12/08/2016. Stefan Markovic (SRB) of Serbia runs on the court as bench offers encouragement. REUTERS/Damir Sagolj

2016 Rio Olympics - Basketball - Preliminary - Men's Preliminary Round Group A USA v Serbia - Carioca Arena 1 - Rio de Janeiro, Brazil - 12/08/2016. Milos Teodosic (SRB) of Serbia drives to the basket. REUTERS/Marko Djurica

2016 Rio Olympics - Basketball - Preliminary - Men's Preliminary Round Group A USA v Serbia - Carioca Arena 1 - Rio de Janeiro, Brazil - 12/08/2016. Kevin Durant (USA) of the USA, Draymond Green (USA) of the USA and Klay Thompson (USA) of the USA wave after game. REUTERS/Marko Djurica

2016 Rio Olympics - Basketball - Preliminary - Men's Preliminary Round Group A USA v Serbia - Carioca Arena 1 - Rio de Janeiro, Brazil - 12/08/2016. Kevin Durant (USA) of the USA fouls Nikola Jokic (SRB) of Serbia. REUTERS/Jim Young

2016 Rio Olympics - Basketball - Preliminary - Men's Preliminary Round Group A USA v Serbia - Carioca Arena 1 - Rio de Janeiro, Brazil - 12/08/2016. Nikola Jokic (SRB) of Serbia shoots over Draymond Green (USA) of the USA. REUTERS/Marko Djurica

2016 Rio Olympics - Basketball - Preliminary - Men's Preliminary Round Group A USA v Serbia - Carioca Arena 1 - Rio de Janeiro, Brazil - 12/08/2016. Kevin Durant (USA) of the USA dunks over Nikola Kalinic (SRB) of Serbia. REUTERS/Jim Young

2016 Rio Olympics - Basketball - Preliminary - Men's Preliminary Round Group A USA v Serbia - Carioca Arena 1 - Rio de Janeiro, Brazil - 12/08/2016. Kyrie Irving (USA) of the USA shoots over Stefan Jovic (SRB) of Serbia. REUTERS/Jim Young