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Novak Djokovic of Serbia (L) hits a return to Roger Federer of Switzerland their Semifinal round match on the thirteenth day of the 2011 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA 10 September 2011. The US Open has been extended due to weather for the fourth year in a row and the men's final will now be played on 12 September 2011. (KEYSTONE/EPA/JOHN G. MABANGLO)