Olympic and Paralympic track star Oscar Pistorius leaves court after appearing for the 2013 killing of his girlfriend Reeva Steenkamp in the North Gauteng High Court in Pretoria, South Africa, June 14, 2016. REUTERS/Siphiwe Sibeko/Files

Olympic and Paralympic track star Oscar Pistorius leaves court after appearing for the 2013 killing of his girlfriend Reeva Steenkamp in the North Gauteng High Court in Pretoria, South Africa, June 14, 2016. REUTERS/Siphiwe Sibeko/Files

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

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. 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. 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. Ana Ivanovic (SRB) of Serbia in action against Carla Suarez Navarro (ESP) of Spain. REUTERS/Toby Melville