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SYDNEY, AUSTRALIA - JANUARY 11: Barbora Strycova of the Czech Repuplic plays a backhand during her womens singles match against Caroline Wozniacki of Denmark during day four of the 2017 Sydney International at Sydney Olympic Park Tennis Centre on January 11, 2017 in Sydney, Australia. (Photo by Cameron Spencer/Getty Images)

SYDNEY, AUSTRALIA - JANUARY 11:  Barbora Strycova of the Czech Repuplic plays a backhand during her womens singles match against Caroline Wozniacki of Denmark during day four of the 2017 Sydney International at Sydney Olympic Park Tennis Centre on January 11, 2017 in Sydney, Australia.  (Photo by Cameron Spencer/Getty Images)