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BRISBANE, AUSTRALIA - JANUARY 03: Kei Nishikori of Japan celebrates in his match against Grigor Dimitrov during day five of the 2019 Brisbane International at Pat Rafter Arena on January 03, 2019 in Brisbane, Australia. (Photo by Chris Hyde/Getty Images)

BRISBANE, AUSTRALIA - JANUARY 03: Kei Nishikori of Japan celebrates in his match against Grigor Dimitrov during day five of the 2019 Brisbane International at Pat Rafter Arena on January 03, 2019 in Brisbane, Australia. (Photo by Chris Hyde/Getty Images)