BRISBANE, AUSTRALIA - JANUARY 06: Kei Nishikori of Japan plays a forehand against Jordan Thompson of Australia on day six of the 2017 Brisbane International at Pat Rafter Arena on January 6, 2017 in Brisbane, Australia. (Photo by Bradley Kanaris/Getty Images)

BRISBANE, AUSTRALIA - JANUARY 06:  Kei Nishikori of Japan plays a forehand against Jordan Thompson of Australia on day six of the 2017 Brisbane International at Pat Rafter Arena on January 6, 2017 in Brisbane, Australia. (Photo by Bradley Kanaris/Getty Images)