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epa07811916 Novak Djokovic (L) of Serbia embraces Stan Wawrinka (R) of Switzerland after Djokovic retired in the third set during a match on the seventh day of the US Open Tennis Championships the USTA National Tennis Center in Flushing Meadows, New York, USA, 01 September 2019. The US Open runs from 26 August through to 08 September 2019. EPA/JUSTIN LANE