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epa03856821 Novak Djokovic of Serbia (L) and Stanislas Wawrinka of Switzerland (R) embrace at the net after 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