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MELBOURNE, AUSTRALIA - JANUARY 22: Andy Murray of Great Britain plays a backhand in his fourth round match against Mischa Zverev of Germany on day seven of the 2017 Australian Open at Melbourne Park on January 22, 2017 in Melbourne, Australia. (Photo by Michael Dodge/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 22:  Andy Murray of Great Britain plays a backhand in his fourth round match against Mischa Zverev of Germany on day seven of the 2017 Australian Open at Melbourne Park on January 22, 2017 in Melbourne, Australia.  (Photo by Michael Dodge/Getty Images)