2016 Rio Olympics - Cycling Track - Women's Team Pursuit Final Gold Race - Rio Olympic Velodrome - Rio de Janeiro, Brazil - 13/08/2016. Kate Archibald (GBR) of Britain, Laura Trott (GBR) of Britain, Elinor Barker (GBR) of Britain and Joanna Rowsell (GBR) of Britain compete. REUTERS/Matthew Childs

2016 Rio Olympics - Tennis - Semifinal - Men's Singles Semifinals - Olympic Tennis Centre - Rio de Janeiro, Brazil - 13/08/2016. Andy Murray (GBR) of Britain celebrates after winning match against Kei Nishikori (JPN) of Japan. REUTERS/Kevin Lamarque

2016 Rio Olympics - Tennis - Semifinal - Men's Singles Semifinals - Olympic Tennis Centre - Rio de Janeiro, Brazil - 13/08/2016. Andy Murray (GBR) of Britain celebrates after winning match against Kei Nishikori (JPN) of Japan. REUTERS/Kevin Lamarque

2016 Rio Olympics - Tennis - Semifinal - Men's Singles Semifinals - Olympic Tennis Centre - Rio de Janeiro, Brazil - 13/08/2016. Kei Nishikori (JPN) of Japan in action against Andy Murray (GBR) of Britain. REUTERS/Kevin Lamarque

2016 Rio Olympics - Tennis - Semifinal - Men's Singles Semifinals - Olympic Tennis Centre - Rio de Janeiro, Brazil - 13/08/2016. Andy Murray (GBR) of Britain serves against Kei Nishikori (JPN) of Japan. REUTERS/Kevin Lamarque

2016 Rio Olympics - Tennis - Semifinal - Men's Singles Semifinals - Olympic Tennis Centre - Rio de Janeiro, Brazil - 13/08/2016. Andy Murray (GBR) of Britain celebrates after winning match against Kei Nishikori (JPN) of Japan. REUTERS/Kevin Lamarque

2016 Rio Olympics - Tennis - Semifinal - Men's Singles Semifinals - Olympic Tennis Centre - Rio de Janeiro, Brazil - 13/08/2016. Andy Murray (GBR) of Britain celebrates after winning match against Kei Nishikori (JPN) of Japan. REUTERS/Toby Melville

2016 Rio Olympics - Tennis - Semifinal - Men's Singles Semifinals - Olympic Tennis Centre - Rio de Janeiro, Brazil - 13/08/2016. Andy Murray (GBR) of Britain shakes hands with Kei Nishikori (JPN) of Japan after winning their match. REUTERS/Toby Melville