2016 Rio Olympics - Basketball - Preliminary - Men's Preliminary Round Group A USA v Serbia - Carioca Arena 1 - Rio de Janeiro, Brazil - 12/08/2016. Demar Derozan (USA) of the USA, Nikola Kalinic (SRB) of Serbia and Bogdan Bogdanovic (SRB) of Serbia in action. 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 drives through Milos Teodosic (SRB) of Serbia and Nikola Jokic (SRB) of Serbia. REUTERS/Marko Djurica

2016 Rio Olympics - Swimming - Victory Ceremony - Men's 50m Freestyle Victory Ceremony - Olympic Aquatics Stadium - Rio de Janeiro, Brazil - 12/08/2016. Anthony Ervin (USA) of USA celebrates with his gold meda while holding his national flag. REUTERS/Stefan Wermuth

2016 Rio Olympics - Swimming - Victory Ceremony - Men's 50m Freestyle Victory Ceremony - Olympic Aquatics Stadium - Rio de Janeiro, Brazil - 12/08/2016. Anthony Ervin (USA) of USA poses with his gold medal next to Florent Manaudou (FRA) of France and Nathan Adrian (USA) of USA. REUTERS/Stefan Wermuth

2016 Rio Olympics - Swimming - Victory Ceremony - Men's 50m Freestyle Victory Ceremony - Olympic Aquatics Stadium - Rio de Janeiro, Brazil - 12/08/2016. Anthony Ervin (USA) of USA celebrates with his gold medal. REUTERS/Michael Dalder

2016 Rio Olympics - Athletics - Final - Women's Shot Put Final - Olympic Stadium - Rio de Janeiro, Brazil - 12/08/2016. Michelle Carter (USA) of USA celebrates after winning the gold medal in the women's shot put. REUTERS/Phil Noble

2016 Rio Olympics - Athletics - Final - Women's Shot Put Final - Olympic Stadium - Rio de Janeiro, Brazil - 12/08/2016. Michelle Carter (USA) of USA competes. REUTERS/Kai Pfaffenbach

2016 Rio Olympics - Athletics - Final - Women's Shot Put Final - Olympic Stadium - Rio de Janeiro, Brazil - 12/08/2016. Michelle Carter (USA) of USA celebrates after winning the gold medal in the women's shot put. REUTERS/Kai Pfaffenbach