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NEW YORK - SEPTEMBER 01: Novak Djokovic stretches to return a shot from Ivan Ljubicic during day two of the 2009 U.S. Open at the USTA Billie Jean King National Tennis Center on September 1, 2009 in Flushing neighborhood of the Queens borough of New York City. (Photo by Rob Tringali/Sportschrome) *** Local Caption *** Novak Djokovic