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MELBOURNE, AUSTRALIA - JANUARY 26: Roger Federer of Switzerland celebrates winning match point in his semifinal match against Stan Wawrinka 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:  Roger Federer of Switzerland celebrates winning match point in his semifinal match against Stan Wawrinka 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: Roger Federer of Switzerland celebrates winning match point in his semifinal match against Stan Wawrinka 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:  Roger Federer of Switzerland celebrates winning match point in his semifinal match against Stan Wawrinka 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: Roger Federer of Switzerland celebrates winning match point in his semifinal match against Stan Wawrinka 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:  Roger Federer of Switzerland celebrates winning match point in his semifinal match against Stan Wawrinka 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: Roger Federer of Switzerland celebrates winning the first set in his semifinal match against Stan Wawrinka 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:  Roger Federer of Switzerland celebrates winning the first set in his semifinal match against Stan Wawrinka 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: Roger Federer of Switzerland celebrates winning the first set in his semifinal match against Stan Wawrinka of Switzerland on day 11 of the 2017 Australian Open at Melbourne Park on January 26, 2017 in Melbourne, Australia. (Photo by Pat Scala/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 26:  Roger Federer of Switzerland celebrates winning the first set in his semifinal match against Stan Wawrinka of Switzerland on day 11 of the 2017 Australian Open at Melbourne Park on January 26, 2017 in Melbourne, Australia.  (Photo by Pat Scala/Getty Images)