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Novak Djokovic of Serbia poses with the U.S. Open tennis championship trophy, Monday, Sept. 14, 2015 in New York's Central Park. Djokovic defeated Roger Federer 6-4, 5-7, 6-4, 6-4 Sunday to earn his second U.S. Open title, third major championship of the year and 10th Grand Slam trophy in all. (AP Photo/Mark Lennihan)