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MELBOURNE, AUSTRALIA - JANUARY 22: Roger Federer of Switzerland celebrates winning in his fourth round match against Kei Nishikori of Japan 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:  Roger Federer of Switzerland celebrates winning in his fourth round match against Kei Nishikori of Japan on day seven of the 2017 Australian Open at Melbourne Park on January 22, 2017 in Melbourne, Australia.  (Photo by Michael Dodge/Getty Images)