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epa03856699 Novak Djokovic of Serbia hits a return to Stanislas Wawrinka of Switzerland during their semifinals round match on the thirteenth day of the 2013 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 07 September 2013. The US Open runs through Monday 09 September, a 15-day schedule for the first time. EPA/ANDREW GOMBERT