2016 Rio Olympics - Tennis - Preliminary - Women's Singles First Round - Olympic Tennis Centre - Rio de Janeiro, Brazil - 06/08/2016. Carla Suarez Navarro (ESP) of Spain in action against Ana Ivanovic (SRB) of Serbia. REUTERS/Toby Melville

2016 Rio Olympics - Tennis - Preliminary - Women's Singles First Round - Olympic Tennis Centre - Rio de Janeiro, Brazil - 06/08/2016. Ana Ivanovic (SRB) of Serbia in action against Carla Suarez Navarro (ESP) of Spain. REUTERS/Toby Melville

2016 Rio Olympics - Tennis - Preliminary - Women's Singles First Round - Olympic Tennis Centre - Rio de Janeiro, Brazil - 06/08/2016. Kirsten Flipkens (BEL) of Belgium celebrates after winning her match against Venus Williams (USA) of USA. REUTERS/Kevin Lamarque

2016 Rio Olympics - Tennis - Preliminary - Women's Singles First Round - Olympic Tennis Centre - Rio de Janeiro, Brazil - 06/08/2016. Venus Williams (USA) of USA reacts during her match against Kirsten Flipkens (BEL) of Belgium. REUTERS/Kevin Lamarque

2016 Rio Olympics - Tennis - Preliminary - Women's Singles First Round - Olympic Tennis Centre - Rio de Janeiro, Brazil - 06/08/2016. Carla Suarez Navarro (ESP) reacts after winning her match against Ana Ivanovic (SRB) of Serbia. REUTERS/Toby Melville

A television cameraman films two holes in the tent that serves as a media center for the Deodoro Olympic Equestrian Center during the first day of competition of the Rio 2016 Olympic Games, in Rio de Janeiro, Brazil, August 6, 2016. REUTERS/Tony Gentile

A television cameraman films two holes in the tent that serves as a media center for the Deodoro Olympic Equestrian Center during the first day of competition of the Rio 2016 Olympic Games, in Rio de Janeiro, Brazil, August 6, 2016. REUTERS/Tony Gentile

2016 Rio Olympics - Swimming - Semifinal - Men's 100m Breaststroke Semifinals - Olympic Aquatics Stadium - Rio de Janeiro, Brazil - 06/08/2016. Adam Peaty (GBR) of United Kingdom reacts REUTERS/David Gray