- Stan Wawrinka was leading match 6-4, 7-5, 2-1
- Serbian world No 1 suffering with shoulder complaint
Novak Djokovic’s US Open title defence came to a halt on Sunday when the Serb retired from his fourth-round match against Stan Wawrinka due to a shoulder injury.
Wawrinka was leading 6-4, 7-5, 2-1 when world No 1 Djokovic, who won four of the last five grand slam titles, decided he could not continue and walked off the Arthur Ashe Stadium court to a chorus of boos.
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