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PARIS, FRANCE - MAY 29: Kei Nishikori of Japan returns to Richard Gasquet of France during the men's single fourth round match at the French Open tennis tournament at Roland Garros Stadium in Paris, France on May 29, 2016. (Photo by Mustafa Yalcin/Anadolu Agency/Getty Images)

PARIS, FRANCE - MAY 29: Kei Nishikori of Japan returns to Richard Gasquet of France during the men's single fourth round match at the French Open tennis tournament at Roland Garros Stadium in Paris, France on May 29, 2016. (Photo by Mustafa Yalcin/Anadolu Agency/Getty Images)