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epa02908413 Vogue Magazine editor-in-chief Anna Wintour in the stands before the start of the Seminfinal match between Novak Djokovic of Serbia and Roger Federer of Switzerland 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. EPA/ANDREW GOMBERT