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PARIS, FRANCE - MAY 23: Kei Nishikori (C) of Japan returns the ball during men's single first round match against Simone Bolelli of Italy at the French Open tennis tournament at Roland Garros in Paris, France on May 23, 2016. (Photo by Mustafa Yalcin/Anadolu Agency/Getty Images)

PARIS, FRANCE - MAY 23: Kei Nishikori (C) of Japan returns the ball during men's single first round match against Simone Bolelli of Italy at the French Open tennis tournament at Roland Garros in Paris, France on May 23, 2016. (Photo by Mustafa Yalcin/Anadolu Agency/Getty Images)