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U.S. Open men's singles tennis champion Stan Wawrinka takes a selfie picture as he poses for photos at the "Top of the Rock," in New York's Rockefeller Center, Monday, Sept. 12, 2016. Wawrinka wore down Novak Djokovic and beat the defending champion 6-7 (1), 6-4, 7-5, 6-3 on Sunday for his first U.S. Open title and third Grand Slam trophy overall. (AP Photo/Richard Drew)