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epa04929513 Novak Djokovic of Serbia reacts after defeating Roger Federer of Switzerland to win the men's final on the fourteenth day of the 2015 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 13 September 2015. The US Open runs through 13 September, which is a return to a 14-day schedule. EPA/BRIAN HIRSCHFELD