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epa04385080 Roger Federer of Switzerland hits a return to Gael Monfils of France during their quarterfinals round match on the eleventh day of the 2014 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 04 September 2014. The US Open runs through 08 September, a 15-day schedule. EPA/JOHN G. MABANGLO