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epa04926311 Roger Federer of Switzerland (L) and Stan Wawrinka of Switzerland at the net after their Semifinals round match on the twelfth day of the 2015 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 11 September 2015. The US Open runs through 13 September, which is a return to a 14-day schedule. EPA/JOHN G. MABANGLO