NEW YORK (AP) — Ben Shelton had just acrobatically taken the third set of his U.S. Open third-round match, getting up from a tumble to the court during the point and then throwing his left arm into the air to encourage cheers after he won it. Just minutes later, he began feeling pain that would ultimately force him to stop playing during a match for the first time in his career.

The No. 6-seeded Shelton quit after losing the fourth set Friday against Adrian Mannarino because of a left shoulder injury, and No. 17 Frances Tiafoe lost shortly after to leave just two U.S. men remaining of the 23 who began the tournament. Speaking quietly and without many specifics, Shelton said he couldn't pinpoint what caused the injury or what it was. He had never stopped in 178 professional matches. “Usual

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