epa04388164 Chelsea Clinton (L), daughter of former US president Bill Clinton, and her husband Marc Mezvinsky (R) watch Novak Djokovic of Serbia play Kei Nishikori of Japan during their semifinals round match on the thirteenth day of the 2014 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 06 September 2014. The US Open runs through 08 September, a 15-day schedule. EPA/ANDREW GOMBERT
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