NEW YORK, NY - SEPTEMBER 05: Mackenzie McDonald of the United States of America plays a forehand during his boys' singles third round match against Collin Altamirano of the United States of America on Day Eleven of the 2013 US Open at USTA Billie Jean King National Tennis Center on September 5, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Dan Istitene/Getty Images)
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