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PARIS, FRANCE - MAY 26: Kei Nishikori of Japan serves in his mens singles first round match against Quentin Halys of France during Day one of the 2019 French Open at Roland Garros on May 26, 2019 in Paris, France. (Photo by Clive Mason/Getty Images)

PARIS, FRANCE - MAY 26: Kei Nishikori of Japan serves in his mens singles first round match against Quentin Halys of France during Day one of the 2019 French Open at Roland Garros on May 26, 2019 in Paris, France. (Photo by Clive Mason/Getty Images)