PARIS — Casper Ruud is hardly an up-and-comer simply trying to make his way — and a living — in professional tennis. He's a three-time Grand Slam finalist, ranked No. 8, the owner of more clay-court victories than any other man since 2020 and someone who's earned nearly $25 million in prize money.

And yet Ruud felt the need to play through pain for the better part of two months, right up until the moment the left knee that's been swollen from a build-up of fluid, that's prompted him to pop pills, that's ached every time he slides into an open-stance backhand, became too problematic during a French Open second-round match. He didn't stop, but he did drop 13 of the last 14 games in a loss Wednesday.

Afterward, the 26-year-old Norwegian voiced concerns, also expressed this week by other pla

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