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epa04390412 Serena Williams of the US serves to Caroline Wozniacki of Denmark during the women's final match on the fourteenth day of the 2014 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 07 September 2014. The US Open runs through 08 September, a 15-day schedule. EPA/CJ GUNTHER