MIAMI GARDENS, FLORIDA - MARCH 20: Kei Nishikori of Japan with his coach Michael Chang on the practice courts at the Hard Rock Stadium, before his first match of the Miami Open on March 20, 2019 in Miami Gardens, Florida. (Photo by TPN/TPN)
MIAMI GARDENS, FLORIDA - MARCH 20: Kei Nishikori of Japan with his coach Michael Chang on the practice courts at the Hard Rock Stadium, before his first match of the Miami Open on March 20, 2019 in Miami Gardens, Florida. (Photo by TPN/TPN)