NEW YORK, NY - SEPTEMBER 03: Caroline Wozniacki of Denmark returns a shot to Petra Cetkovska of Czech Republic during their Women's Singles Second Round match on Day Four of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images)
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