The US Open rolls on, but some players face an unfortunate end to their run. Sixth seed Ben Shelton was forced to retire from his third-round clash with Adrian Mannarino after an injury. The withdrawal came out of nowhere. As Shelton prepared to serve in the third set, he cried out in pain and called for a medical timeout. Moments later, the American pulled out, handing the Frenchman a place in the fourth round. In light of such Grand Slam withdrawals, Brad Gilbert and Andy Roddick have weighed in.

During an episode of the Served podcast posted on September 3, Roddick sat down with Coco Gauff’s former coach and ex-ATP pro Brad Gilbert. A panel of tennis insiders joined them to tackle some tough questions. One stood out: “As a player and as a coach, what is the threshold for an injury b

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