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RIO DE JANEIRO, BRAZIL - AUGUST 07: Nao Hibino of Japan plays a forehand against Irina-Camelia Begu of Romania during their first round singles match on Day 2 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 7, 2016 in Rio de Janeiro, Brazil. (Photo by Clive Brunskill/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 07:  Nao Hibino of Japan plays a forehand against Irina-Camelia Begu of Romania during their first round singles match on Day 2 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 7, 2016 in Rio de Janeiro, Brazil.  (Photo by Clive Brunskill/Getty Images)