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SYDNEY, AUSTRALIA - JANUARY 13: Simona Halep of Romania plays a backhand in her match against Karolina Pliskova of the Czech Republic during day four of the Sydney International at Sydney Olympic Park Tennis Centre on January 13, 2016 in Sydney, Australia. (Photo by Matt King/Getty Images)

SYDNEY, AUSTRALIA - JANUARY 13:  Simona Halep of Romania plays a backhand in her match against Karolina Pliskova of the Czech Republic during day four of the Sydney International at Sydney Olympic Park Tennis Centre on January 13, 2016 in Sydney, Australia.  (Photo by Matt King/Getty Images)