RIO DE JANEIRO, BRAZIL - AUGUST 12: Kei Nishikori of Japan returns a backhand against Gael Monfils of France in the Men's Singles Quarterfinal on Day 7 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 12, 2016 in Rio de Janeiro, Brazil. (Photo by Mark Kolbe/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 12: Gael Monfils of France returns a backhand against Kei Nishikori of Japan in the Men's Singles Quarterfinal on Day 7 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 12, 2016 in Rio de Janeiro, Brazil. (Photo by Mark Kolbe/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 12: Gael Monfils of France (R) and Kei Nishikori of Japan embrace following the Men's Singles Quarterfinal match on Day 7 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 12, 2016 in Rio de Janeiro, Brazil. (Photo by Mark Kolbe/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 12: Gael Monfils of France looks on during the Men's Singles Quarterfinal match against Kei Nishikori of Japan on Day 7 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 12, 2016 in Rio de Janeiro, Brazil. (Photo by Mark Kolbe/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 12: Kei Nishikori of Japan celebrates victory against Gael Monfils of France in the Men's Singles Quarterfinal on Day 7 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 12, 2016 in Rio de Janeiro, Brazil. (Photo by Mark Kolbe/Getty Images)
