NEW YORK, NY - SEPTEMBER 03: Serena Williams of United States returns the ball to Flavia Pennetta of Italia during women's singles quarterfinal match on Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center in New York, United States on September 3, 2014. (Photo by Bilgin S. Sasmaz/Anadolu Agency/Getty Images)
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