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BRISBANE, AUSTRALIA - JANUARY 06: Kei Nishikori of Japan plays a backhand in the Men’s Finals match against Daniil Medvedev of Russia during day eight of the 2019 Brisbane International at Pat Rafter Arena on January 06, 2019 in Brisbane, Australia. (Photo by Chris Hyde/Getty Images)

BRISBANE, AUSTRALIA - JANUARY 06: Kei Nishikori of Japan plays a backhand in the Men’s Finals match against Daniil Medvedev of Russia during day eight of the 2019 Brisbane International at Pat Rafter Arena on January 06, 2019 in Brisbane, Australia. (Photo by Chris Hyde/Getty Images)