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epa03839772 Novak Djokovic of Serbia reacts after defeating Ricardas Berankis of Lithuania during their match on the second day of the 2013 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 27 August 2013. The US Open runs through Monday 09 September, a 15-day schedule for the first time EPA/JOHN G. MABANGLO