PARIS, FRANCE - MAY 23: Kei Nishikori of Japan with his coach Michael Chang during practice before the 2019 French Open at Roland Garros stadium on May 23, 2019 in Paris, France. (Photo by Jean Catuffe/Getty Images)
PARIS, FRANCE - MAY 23: Kei Nishikori of Japan with his coach Michael Chang during practice before the 2019 French Open at Roland Garros stadium on May 23, 2019 in Paris, France. (Photo by Jean Catuffe/Getty Images)