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

Maria Sharapova of Russia speaks during a news conference at the Brisbane International tennis tournament in Brisbane, Australia on January 1, 2013. REUTERS/Daniel Munoz/File Photo

Cleveland Cavaliers Lebron James celebrates with the crowd during a parade to celebrate winning the 2016 NBA Championship in downtown Cleveland, Ohio, U.S. June 22, 2016. REUTERS/Aaron Josefczyk

A loud blast shook the media seats near the finishing line of the men's cycling road race on the first day when Brazil's bomb squad detonated an unattended backpack, amid tight security at South America's first Games. REUTERS/Paul Hanna

2016 Rio Olympics - Golf - Preliminary - Training session - Olympic Golf Course - Rio de Janeiro, Brazil 08/08/2016. The golf clubs of Australian team members Marcus Fraser and Scott Hend lay beside the practice area. REUTERS/Andrew Boyers

2016 Rio Olympics - Golf - Preliminary - Men's Individual Stroke Play - Olympic Golf Course - Rio de Janeiro, Brazil - 11/08/2016. - Marcus Fraser (AUS) of Australia hits his tee shot on the 18th hole during the first round of the men's Olympic golf compeititon. REUTERS/Andrew Boyers