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Caroline Wozniacki of Denmark hits a return towards Carla Suarez Navarro of Spain during their women's singles second round match at the WTA Pan Pacific Open tennis tournament in Tokyo on September 21, 2016. / AFP / TOSHIFUMI KITAMURA (Photo credit should read TOSHIFUMI KITAMURA/AFP/Getty Images)

Caroline Wozniacki of Denmark hits a return towards Carla Suarez Navarro of Spain during their women's singles second round match at the WTA Pan Pacific Open tennis tournament in Tokyo on September 21, 2016. / AFP / TOSHIFUMI KITAMURA        (Photo credit should read TOSHIFUMI KITAMURA/AFP/Getty Images)