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epa07815410 Stan Wawrinka of Switzerland hits a return to Daniil Medvedev of Russia during their quarter-finals round match on the ninth day of the US Open Tennis Championships the USTA National Tennis Center in Flushing Meadows, New York, USA, 03 September 2019. The US Open runs from 26 August through 08 September. EPA/JOHN G. MABANGLO