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Stan Wawrinka advanced to the U.S. Open quarterfinals after Novak Djokovic retired due to injury in the third set of their fourth-round match Sunday.

Wawrinka moved on with a 6-4, 7-5, 2-1 win.

Djokovic was getting treatment on his left shoulder between the second and third set. The injury has bothered him throughout the tournament, particularly in his second-round match against Juan Ignacio Londero.

Wawrinka broke Djokovic’s serve in the third game of the set before the two shook hands. The crowd booed Djokovic for his decision. 

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Following the victory, the 34-year-old Wawrinka signed a fan's head. 

Djokovic was seeded No. 1 and seeking a fourth title in New York.