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BRISBANE, AUSTRALIA - JANUARY 03: Kei Nishikori of Japan in action against Grigor Dimitrov of Bulgaria during day five of the 2019 Brisbane International at Pat Rafter Arena on January 3, 2019 in Brisbane, Australia. (Photo by TPN/Getty Images)'n'n'n

BRISBANE, AUSTRALIA - JANUARY 03: Kei Nishikori of Japan in action against Grigor Dimitrov of Bulgaria during day five of the 2019 Brisbane International at Pat Rafter Arena on January 3, 2019 in Brisbane, Australia. (Photo by TPN/Getty Images)'n'n'n