Novak Djokovic’s US Open title defence came to an end after he was forced to retire injured when trailing two sets down to Stan Wawrinka.
The crowd on Arthur Ashe were stunned when the world No 1 approached Wawrinka and embraced him with the scores 6-4 7-5 2-1.
Djokovic had struggled with a left shoulder injury all week, although it was not apparent during the opening two sets with Wawrinka reprising the sort of form which made him the champion in 2016.
But the Serb took a medical time-out after dropping the second set, and two games into the third he decided enough was enough.
It means Wawrinka will face fifth seed Daniil Medvedev in the quarter-finals
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