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NEW YORK - SEPTEMBER 14: Juan Martin Del Potro of Argentina kisses the US Open championship trophy after defeating Roger Federer 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/Getty Images)

NEW YORK - SEPTEMBER 14: Juan Martin Del Potro of Argentina kisses the US Open championship trophy after defeating Roger Federer 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/Getty Images)