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NEW YORK, NY - SEPTEMBER 04: Mariana Duque-Marino of Colombia returns a shot to Roberta Vinci of Italy during their Women's Singles Third Round match on Day Five of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 4, 2015 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Alex Goodlett/Getty Images)

NEW YORK, NY - SEPTEMBER 04:  Mariana Duque-Marino of Colombia returns a shot to Roberta Vinci of Italy during their Women's Singles Third Round match on Day Five of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 4, 2015 in the Flushing neighborhood of the Queens borough of New York City.  (Photo by Alex Goodlett/Getty Images)