SYDNEY, AUSTRALIA - JANUARY 14: Gilles Muller of Luxembourg plays a backhand in the men's final match against Daniel Evans of Great Britain during the 2017 Sydney International at Sydney Olympic Park Tennis Centre on January 14, 2017 in Sydney, Australia. (Photo by Brendon Thorne/Getty Images)
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SYDNEY, AUSTRALIA - JANUARY 14: Gilles Muller of Luxembourg plays a backhand in the men's final match against Daniel Evans of Great Britain during the 2017 Sydney International at Sydney Olympic Park Tennis Centre on January 14, 2017 in Sydney, Australia. (Photo by Brendon Thorne/Getty Images)
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Getty Images Sport Brendon Thorne

SYDNEY, AUSTRALIA - JANUARY 14: Gilles Muller of Luxembourg plays a forehand in the men's final match against Daniel Evans of Great Britain during the 2017 Sydney International at Sydney Olympic Park Tennis Centre on January 14, 2017 in Sydney, Australia. (Photo by Brendon Thorne/Getty Images)
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Getty Images Sport Brendon Thorne

SYDNEY, AUSTRALIA - JANUARY 14: Gilles Muller of Luxembourg plays a backhand in the men's final match against Daniel Evans of Great Britain during the 2017 Sydney International at Sydney Olympic Park Tennis Centre on January 14, 2017 in Sydney, Australia. (Photo by Brendon Thorne/Getty Images)
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Getty Images Sport Brendon Thorne

SYDNEY, AUSTRALIA - JANUARY 14: Gilles Muller of Luxembourg celebrates after winning the men's final match against Daniel Evans of Great Britain during the 2017 Sydney International at Sydney Olympic Park Tennis Centre on January 14, 2017 in Sydney, Australia. (Photo by Brendon Thorne/Getty Images)
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Getty Images Sport Brendon Thorne