PARIS, FRANCE - MAY 31: Kei Nishikori of Japan serves against Laslo Djere of Serbia in the third round of the men's singles during Day 6 of the 2019 French Open at Roland Garros on May 31, 2019 in Paris, France. (Photo by TPN/Getty Images)
PARIS, FRANCE - MAY 31: Kei Nishikori of Japan serves against Laslo Djere of Serbia in the third round of the men's singles during Day 6 of the 2019 French Open at Roland Garros on May 31, 2019 in Paris, France. (Photo by TPN/Getty Images)