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MELBOURNE, AUSTRALIA - JANUARY 24: Stan Wawrinka of Switzerland serves in his quarterfinal match against Jo-Wilfried Tsonga of France on day nine of the 2017 Australian Open at Melbourne Park on January 24, 2017 in Melbourne, Australia. (Photo by Michael Dodge/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 24: Stan Wawrinka of Switzerland serves in his quarterfinal match against Jo-Wilfried Tsonga of France on day nine of the 2017 Australian Open at Melbourne Park on January 24, 2017 in Melbourne, Australia. (Photo by Michael Dodge/Getty Images)
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