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NEW YORK - SEPTEMBER 14: Roger Federer of Switzerland returns a ball to Juan Martin Del Potro of Argentina on day fifteen of the 2009 U.S. Open at the USTA Billie Jean King National Tennis Center on September 14, 2009 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Rob Tringali/Sportschrome) *** Local Caption *** Roger Federer