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Serbia's Novak Djokovic celebrates after defeating Andy Roddick, U.S.A, eighth seed, during their quarter-final match at the U.S. Open tennis championship at the U.S. National Tennis Center on September 4, 2008 in Flushing Meadows, New York. Djokoic won 6-2, 6-3, 3-6, 7-6(5). (UPI Photo/Monika Graff)
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