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epa02329635 Roger Federer of Switzerland hits a return to Novak Djokovic of Serbia during their semifinal round match at the 2010 US Open Tennis Championship at the USTA National Tennis Center in Flushing, Meadows, New York, USA, 11 September 2010. The US Open Championship runs through 12 September when the men's final is scheduled to be played. EPA/JOHN G. MABANGLO