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epa04929279 Novak Djokovic of Serbia (R) falls as he chased a return to Roger Federer of Switzerland (L) during 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