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Nadal of Spain hits a return to Djokovic of Serbia in their men's final match at the U.S. Open tennis championships in New York

Rafael Nadal of Spain hits a return to Novak Djokovic of Serbia in their men's final match at the U.S. Open tennis championships in New York, September 9, 2013. REUTERS/Kena Betancur (UNITED STATES - Tags: SPORT TENNIS)