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MELBOURNE, AUSTRALIA - JANUARY 26: Novak Djokovic of Serbia plays a forehand in his quarter final match against Kei Nishikori of Japan during day nine of the 2016 Australian Open at Melbourne Park on January 26, 2016 in Melbourne, Australia. (Photo by Quinn Rooney/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 26: Novak Djokovic of Serbia plays a forehand in his quarter final match against Kei Nishikori of Japan during day nine of the 2016 Australian Open at Melbourne Park on January 26, 2016 in Melbourne, Australia. (Photo by Quinn Rooney/Getty Images)
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