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BRISBANE, AUSTRALIA - JANUARY 02: Grigor Dimitrov of Bulgaria plays a backhand against Steve Johnson of the USA on day two of the 2017 Brisbane International at Pat Rafter Arena on January 2, 2017 in Brisbane, Australia. (Photo by Bradley Kanaris/Getty Images)

BRISBANE, AUSTRALIA - JANUARY 02: Grigor Dimitrov of Bulgaria plays a backhand against Steve Johnson of the USA on day two of the 2017 Brisbane International at Pat Rafter Arena on January 2, 2017 in Brisbane, Australia.  (Photo by Bradley Kanaris/Getty Images)