RIO DE JANEIRO, BRAZIL - AUGUST 13: Juan Martin Del Potro of Argentina reacts after defeating Rafael Nadal of Spain in the Men's Singles Semifinal Match on Day 8 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 13, 2016 in Rio de Janeiro, Brazil. Del Potro defeated Nadal 5-7, 6-4, 7-6(5). (Photo by Clive Brunskill/Getty Images)
