2016 Rio Olympics - Tennis - Quarterfinal - Men's Singles Quarterfinals - Olympic Tennis Centre - Rio de Janeiro, Brazil - 12/08/2016. A general view of the court as Andy Murray (GBR) of Britain serves against Steve Johnson (USA) of USA. REUTERS/Toby Melville

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

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

Shooting athlete Kim Rhode poses for a portrait during the 2012 U.S. Olympic Team Media Summit in Dallas, Texas May 14, 2012. REUTERS/Lucas Jackson/File Photo

2016 Rio Olympics - Water Polo - Preliminary - Men's Preliminary Round - Group A Australia v Japan - Maria Lenk Aquatics Centre - Rio de Janeiro, Brazil - 10/08/2016. Water turns green in the diving and in the water polo pools in the Aquatics Centre. REUTERS/Laszlo Balogh

2016 Rio Olympics - Diving - Maria Lenk Aquatics Centre - Rio de Janeiro, Brazil - 09/08/2016. Officials look at the Olympic diving pool REUTERS/Antonio Bronic

2016 Rio Olympics - Diving - Maria Lenk Aquatics Centre - Rio de Janeiro, Brazil - 09/08/2016. General view of the Olympic diving pool (L) and the pool for the waterpolo and synchronized swimming (R) this afternoon. REUTERS/Antonio Bronic

2016 Rio Olympics - Athletics - Final - Women's 10,000m Final - Olympic Stadium - Rio de Janeiro, Brazil - 12/08/2016. Almaz Ayana (ETH) celebrates REUTERS/Dylan Martinez