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epa03860181 US singer Randy Jackson watches Novak Djokovic of Serbia play Rafael Nadal of Spain during the men's final on the fifteenth day of the 2013 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 09 September 2013. The US Open runs through Monday 09 September, a 15-day schedule for the first time. EPA/ANDREW GOMBERT