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Germany's Mischa Zverev celebrates his victory against Britain's Andy Murray during their men's singles fourth round match on day seven of the Australian Open tennis tournament in Melbourne on January 22, 2017. / AFP / PAUL CROCK / IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE (Photo credit should read PAUL CROCK/AFP/Getty Images)

Germany's Mischa Zverev celebrates his victory against Britain's Andy Murray during their men's singles fourth round match on day seven of the Australian Open tennis tournament in Melbourne on January 22, 2017. / AFP / PAUL CROCK / IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE        (Photo credit should read PAUL CROCK/AFP/Getty Images)