New York — Novak Djokovic’s US Open title defence came unstuck on Sunday when a nagging shoulder injury forced the world No 1 to retire from his fourth-round match against Stan Wawrinka, prompting boos from the crowd at Flushing Meadows.

Wawrinka was leading 6-4 7-5 2-1 when Djokovic decided he could not continue, the pair embracing at the side of the court before the Serb walked off with his head down low but his left thumb stuck high in the air...

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