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epa03852803 Stanislas Wawrinka of Switzerland hits a return to Andy Murray of Great Britain (L) during their quarterfinals round match on the eleventh day of the 2013 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 05 September 2013. The US Open runs through Monday 09 September, a 15-day schedule for the first time. EPA/JUSTIN LANE