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epa02329574 Roger Federer of Switzerland serves to Novak Djokovic of Serbia (not pictured) 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