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PARIS, FRANCE - JUNE 01: Kei Nishikori of Japan hits a forehand during the men's singles second round match against Jeremy Chardy of France on day five of the 2017 French Open at Roland Garros on June 1, 2017 in Paris, France. (Photo by Adam Pretty/Getty Images)

PARIS, FRANCE - JUNE 01:  Kei Nishikori of Japan hits a forehand during the men's singles second round match against Jeremy Chardy of France on day five of the 2017 French Open  at Roland Garros on June 1, 2017 in Paris, France.  (Photo by Adam Pretty/Getty Images)