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PARIS, FRANCE - MAY 28: Kei Nishikori of Japan between his coaches Dante Bottini and Michael Chang on Day Two of the 2018 French Open at Roland Garros stadium on May 28, 2018 in Paris, France. (Photo by Jean Catuffe/Getty Images)

PARIS, FRANCE - MAY 28: Kei Nishikori of Japan between his coaches Dante Bottini and Michael Chang on Day Two of the 2018 French Open at Roland Garros stadium on May 28, 2018 in Paris, France. (Photo by Jean Catuffe/Getty Images)