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

An agent of the bomb squad in protective clothing stands in the area near the finishing line of the men's cycling road race at the 2016 Rio Olympics after they made a controlled explosion, in Copacabana, Rio de Janeiro, Brazil August 6, 2016. REUTERS/Paul Hanna

An agent of the bomb squad in protective clothing stands in the area near the finishing line of the men's cycling road race at the 2016 Rio Olympics after they made a controlled explosion, in Copacabana, Rio de Janeiro, Brazil August 6, 2016. REUTERS/Paul Hanna