BRISBANE, AUSTRALIA - JANUARY 05: Rafael Nadal of Spain celebrates a point during his quarter final match against Mischa Zverev of Germany during day five of the 2017 Brisbane International at Pat Rafter Arena on January 5, 2017 in Brisbane, Australia. (Photo by Chris Hyde/Getty Images)

BRISBANE, AUSTRALIA - JANUARY 05:  Rafael Nadal of Spain celebrates a point during his quarter final match against Mischa Zverev of Germany during day five of the 2017 Brisbane International at Pat Rafter Arena on January 5, 2017 in Brisbane, Australia.  (Photo by Chris Hyde/Getty Images)