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MELBOURNE, AUSTRALIA - JANUARY 22: A general view of Rod Laver court as Roger Federer of Switzerland plays 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 Clive Brunskill/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 22:  A general view of Rod Laver court as Roger Federer of Switzerland plays 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 Clive Brunskill/Getty Images)