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epa03849729 Novak Djokovic of Serbia hits a return to Marcel Granollers of Spain during their match on the ninth day of the 2013 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 03 September 2013. The US Open runs through Monday 09 September, a 15-day schedule for the first time. EPA/ANDREW GOMBERT