2016 Rio Olympics - Athletics - Final - Women's 800m Final - Olympic Stadium - Rio de Janeiro, Brazil - 20/08/2016. Caster Semenya (RSA) of South Africa competes. REUTERS/Kai Pfaffenbach

2016 Rio Olympics - Athletics - Final - Women's 800m Final - Olympic Stadium - Rio de Janeiro, Brazil - 20/08/2016. Caster Semenya (RSA) of South Africa celebrates winning the gold medal. REUTERS/Dominic Ebenbichler

2016 Rio Olympics - Athletics - Final - Men's 1500m Final - Olympic Stadium - Rio de Janeiro, Brazil - 20/08/2016. First placed Matthew Centrowitz (USA) of USA celebrates next to third placed Nicholas Willis (NZL) of New Zealand. REUTERS/David Gray

2016 Rio Olympics - Athletics - Final - Men's 1500m Final - Olympic Stadium - Rio de Janeiro, Brazil - 20/08/2016. Matthew Centrowitz (USA) of USA wins the gold. REUTERS/Lucy Nicholson

2016 Rio Olympics - Modern Pentathlon - Victory Ceremony - Women's Victory Ceremony - Deodoro Stadium - Rio de Janeiro, Brazil - 19/08/2016. Gold medalist Chloe Esposito (AUS) of Australia reacts. REUTERS/Jeremy Lee

2016 Rio Olympics - Modern Pentathlon - Victory Ceremony - Men's Victory Ceremony - Deodoro Stadium - Rio de Janeiro, Brazil - 20/08/2016. Gold medalist Aleksander Lesun (RUS) of Russia reacts. REUTERS/Jeremy Lee

2016 Rio Olympics - Soccer - Final - Men's Football Tournament Gold Medal Match Brazil vs Germany - Maracana - Rio de Janeiro, Brazil - 20/08/2016. Neymar (BRA) of Brazil celebrates with goalkeeper Weverton (BRA) of Brazil after they won the penalty shootout and the gold medal. REUTERS/Murad Sezer

2016 Rio Olympics - Soccer - Final - Men's Football Tournament Gold Medal Match Brazil vs Germany - Maracana - Rio de Janeiro, Brazil - 20/08/2016. Gabriel Jesus (BRA) of Brazil shoots at the goal as Timo Horn (GER) of Germany blocks. REUTERS/Leonhard Foeger