2016 Rio Olympics - Tennis - Preliminary - Men's Singles Third Round - Olympic Tennis Centre - Rio de Janeiro, Brazil - 11/08/2016. Andy Murray (GBR) of United Kingdom in action against Fabio Fognini (ITA) of Italy. REUTERS/Toby Melville

2016 Rio Olympics - Tennis - Preliminary - Men's Singles Third Round - Olympic Tennis Centre - Rio de Janeiro, Brazil - 11/08/2016. Andy Murray (GBR) of United Kingdom in action against Fabio Fognini (ITA) of Italy. REUTERS/Toby Melville

2016 Rio Olympics - Tennis - Preliminary - Men's Singles Third Round - Olympic Tennis Centre - Rio de Janeiro, Brazil - 11/08/2016. Fabio Fognini (ITA) of Italy leaves after losing his match against Andy Murray (GBR) of United Kingdom. REUTERS/Toby Melville

2016 Rio Olympics - Tennis - Preliminary - Men's Singles Third Round - Olympic Tennis Centre - Rio de Janeiro, Brazil - 11/08/2016. Andy Murray (GBR) of United Kingdom in action against against Fabio Fognini (ITA) of Italy. REUTERS/Toby Melville

Russian track-and-field athlete Yelena Isinbayeva talks on her mobile phone as she attends a prayer service ahead of Russian Olympic team departure to Rio 2016 Olympic Games at the Uspensky (Assumption) Cathedral in the Moscow's Kremlin, Russia July 27, 2016. REUTERS/Maxim Shemetov

2016 Rio Olympics - Swimming - Preliminary - Men's 100m Butterfly - Heats - Olympic Aquatics Stadium - Rio de Janeiro, Brazil - 11/08/2016. Joseph Schooling (SIN) of Singapore reacts next to Michael Phelps (USA) of USA. REUTERS/David Gray

2016 Rio Olympics - Swimming - Preliminary - Men's 100m Butterfly - Heats - Olympic Aquatics Stadium - Rio de Janeiro, Brazil - 11/08/2016. Joseph Schooling (SIN) of Singapore reacts. REUTERS/Dominic Ebenbichler

2016 Rio Olympics - Rowing - Repechage - Men's Single Sculls Repechages - Lagoa Stadium - Rio De Janeiro, Brazil - 07/08/2016. Fans depart the seats at Lagoa Stadium after competition was postponed. REUTERS/Murad Sezer