The Latest: Djokovic out of US Open after retiring in match

              Wang Qiang, of China, reacts after defeating Fiona Ferro, of France, during round three of the US Open tennis championships Friday, Aug. 30, 2019, in New York. (AP Photo/Eduardo Munoz Alvarez)

NEW YORK (AP) — The Latest on the U.S. Open tennis tournament (all times local):

10:50 p.m.

Novak Djokovic has ended his U.S. Open title defense by retiring from his fourth-round match against Stan Wawrinka.

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

But he’s been troubled by a painful left shoulder and did not look to be close to his best for much of the night against Wawrinka.

Djokovic was trailing 6-4, 7-5, 2-1 when he quit.