2016 Rio Olympics - Tennis - Final - Men's Doubles Gold Medal Match - Olympic Tennis Centre - Rio de Janeiro, Brazil - 12/08/2016. Rafael Nadal (ESP) of Spain and Marc Lopez (ESP) of Spain shake hands with Florin Mergea (ROU) of Romania and Horia Tecau (ROU) of Romania after winning their match. REUTERS/Toby Melville

2016 Rio Olympics - Tennis - Quarterfinal - Men's Singles Quarterfinals - Olympic Tennis Centre - Rio de Janeiro, Brazil - 12/08/2016. Thomaz Bellucci (BRA) of Brazil in action against Rafael Nadal (ESP) of Spain. REUTERS/Kevin Lamarque

2016 Rio Olympics - Tennis - Quarterfinal - Men's Singles Quarterfinals - Olympic Tennis Centre - Rio de Janeiro, Brazil - 12/08/2016. Thomaz Bellucci (BRA) of Brazil in action against Rafael Nadal (ESP) of Spain. REUTERS/Kevin Lamarque

2016 Rio Olympics - Tennis - Quarterfinal - Men's Singles Quarterfinals - Olympic Tennis Centre - Rio de Janeiro, Brazil - 12/08/2016. Rafael Nadal (ESP) of Spain in action against Thomaz Bellucci (BRA) of Brazil. REUTERS/Kevin Lamarque

2016 Rio Olympics - Tennis - Quarterfinal - Men's Singles Quarterfinals - Olympic Tennis Centre - Rio de Janeiro, Brazil - 12/08/2016. Rafael Nadal (ESP) of Spain reacts during his match against Thomaz Bellucci (BRA) of Brazil. REUTERS/Kevin Lamarque

2016 Rio Olympics - Tennis - Quarterfinal - Men's Singles Quarterfinals - Olympic Tennis Centre - Rio de Janeiro, Brazil - 12/08/2016. Rafael Nadal (ESP) of Spain in action against Thomaz Bellucci (BRA) of Brazil. REUTERS/Kevin Lamarque

2016 Rio Olympics - Tennis - Quarterfinal - Men's Singles Quarterfinals - Olympic Tennis Centre - Rio de Janeiro, Brazil - 12/08/2016. Steve Johnson (USA) of USA in action against Andy Murray (GBR) of Britain. REUTERS/Toby Melville

2016 Rio Olympics - Tennis - Quarterfinal - Men's Singles Quarterfinals - Olympic Tennis Centre - Rio de Janeiro, Brazil - 12/08/2016. Steve Johnson (USA) of USA in action against Andy Murray (GBR) of Britain. REUTERS/Toby Melville