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MELBOURNE, AUSTRALIA - JANUARY 26: Stan Wawrinka of Switzerland congratulates Roger Federer of Switzerland on winning their semifinal match on day 11 of the 2017 Australian Open at Melbourne Park on January 26, 2017 in Melbourne, Australia. (Photo by Scott Barbour/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 26:  Stan Wawrinka of Switzerland congratulates Roger Federer of Switzerland on winning their semifinal match on day 11 of the 2017 Australian Open at Melbourne Park on January 26, 2017 in Melbourne, Australia.  (Photo by Scott Barbour/Getty Images)

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MELBOURNE, AUSTRALIA - JANUARY 26: Stan Wawrinka of Switzerland congratulates Roger Federer of Switzerland on winning their semifinal match on day 11 of the 2017 Australian Open at Melbourne Park on January 26, 2017 in Melbourne, Australia. (Photo by Clive Brunskill/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 26:  Stan Wawrinka of Switzerland congratulates Roger Federer of Switzerland on winning their semifinal match on day 11 of the 2017 Australian Open at Melbourne Park on January 26, 2017 in Melbourne, Australia.  (Photo by Clive Brunskill/Getty Images)

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MELBOURNE, AUSTRALIA - JANUARY 26: Stan Wawrinka of Switzerland walks off the court after losing his semifinal match against Roger Federer of Switzerland on day 11 of the 2017 Australian Open at Melbourne Park on January 26, 2017 in Melbourne, Australia. (Photo by Scott Barbour/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 26:  Stan Wawrinka of Switzerland walks off the court after losing his semifinal match against Roger Federer of Switzerland on day 11 of the 2017 Australian Open at Melbourne Park on January 26, 2017 in Melbourne, Australia.  (Photo by Scott Barbour/Getty Images)

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MELBOURNE, AUSTRALIA - JANUARY 26: Stan Wawrinka of Switzerland walks off the court after losing his semifinal match against Roger Federer of Switzerland on day 11 of the 2017 Australian Open at Melbourne Park on January 26, 2017 in Melbourne, Australia. (Photo by Clive Brunskill/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 26:  Stan Wawrinka of Switzerland walks off the court after losing his semifinal match against Roger Federer of Switzerland on day 11 of the 2017 Australian Open at Melbourne Park on January 26, 2017 in Melbourne, Australia.  (Photo by Clive Brunskill/Getty Images)

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MELBOURNE, AUSTRALIA - JANUARY 26: Stan Wawrinka of Switzerland congratulates Roger Federer of Switzerland on winning their semifinal match on day 11 of the 2017 Australian Open at Melbourne Park on January 26, 2017 in Melbourne, Australia. (Photo by Clive Brunskill/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 26:  Stan Wawrinka of Switzerland congratulates Roger Federer of Switzerland on winning their semifinal match on day 11 of the 2017 Australian Open at Melbourne Park on January 26, 2017 in Melbourne, Australia.  (Photo by Clive Brunskill/Getty Images)