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MELBOURNE, VIC - JANUARY 20: Kei Nishikori of Japan returns the ball during the third round of the 2017 Australian Open on January 20, 2017, at Melbourne Park Tennis Centre in Melbourne, Australia.(Photo by Jason Heidrich/Icon Sportswire via Getty Images)

MELBOURNE, VIC - JANUARY 20: Kei Nishikori  of Japan returns the ball during the third round of the 2017 Australian Open on January 20, 2017, at Melbourne Park Tennis Centre in Melbourne, Australia.(Photo by Jason Heidrich/Icon Sportswire via Getty Images)