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epa02908380 Fans sit under an umbrella in the upper deck as rain falls in Arthur Ashe Stadium shortly 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