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MELBOURNE, AUSTRALIA - JANUARY 20: Roger Federer of Switzerland plays a backhand in his third round match against Thomas Berdych of the Czech Republic on day five of the 2017 Australian Open at Melbourne Park on January 20, 2017 in Melbourne, Australia. (Photo by Cameron Spencer/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 20:  Roger Federer of Switzerland plays a backhand in his third round match against Thomas Berdych of the Czech Republic on day five of the 2017 Australian Open at Melbourne Park on January 20, 2017 in Melbourne, Australia.  (Photo by Cameron Spencer/Getty Images)