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NEW YORK, NY - SEPTEMBER 02: Roberta Vinci of Italy reacts against Carina Witthoeft of Germany during her third round Women's Singles match on Day Five of the 2016 US Open at the USTA Billie Jean King National Tennis Center on September 2, 2016 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images)

NEW YORK, NY - SEPTEMBER 02:  Roberta Vinci of Italy reacts against Carina Witthoeft of Germany during her third round Women's Singles match on Day Five of the 2016 US Open at the USTA Billie Jean King National Tennis Center on September 2, 2016 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Al Bello/Getty Images)