RIO DE JANEIRO, BRAZIL - AUGUST 06: Kei Nishikori of Japan serves against Albert Ramos-Vinolas of Spain in their first round match on Day 1 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 6, 2016 in Rio de Janeiro, Brazil. (Photo by Clive Brunskill/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 06: Kei Nishikori of Japan serves against Albert Ramos-Vinolas of Spain in their first round match on Day 1 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 6, 2016 in Rio de Janeiro, Brazil. (Photo by Clive Brunskill/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 06: Albert Ramos-Vinolas of Spain plays a backhand against Kei Nishikori of Japan in their first round match on Day 1 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 6, 2016 in Rio de Janeiro, Brazil. (Photo by Clive Brunskill/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 06: Kei Nishikori of Japan plays a forehand against Albert Ramos-Vinolas of Spain in their first round match on Day 1 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 6, 2016 in Rio de Janeiro, Brazil. (Photo by Clive Brunskill/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 06: Kei Nishikori of Japan plays a forehand against Albert Ramos-Vinolas of Spain in their first round match on Day 1 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 6, 2016 in Rio de Janeiro, Brazil. (Photo by Clive Brunskill/Getty Images)
