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epa03385185 Andy Roddick of the US reacts as he plays Juan Martin Del Potro of Argentina during their fourth round match on the tenth day of the 2012 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 05 September 2012. The US Open runs through Sunday 09 September 2012. EPA/LARRY W. SMITH