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epa03848617 Rafael Nadal of Spain hits a return to Philipp Kohlschreiber of Germany during their match on the eighth day of the 2013 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 02 September 2013. The US Open runs through Monday 09 September, a 15-day schedule for the first time. EPA/JASON SZENES