Aryna Sabalenka was sad to see her would-be quarterfinal opponent bow out of the U.S. Open before their Tuesday match.

Markéta Vondroušová withdrew from the Grand Slam with a knee injury that she did not want to exacerbate further.

Sabalenka, the defending women’s singles champion, took to social media to pen an emotional note to Vondroušová.

Marketa Vondrousova, of the Czech Republic, reacts after defeating Elena Rybakina, of Kazakhstan, during the fourth round of the US Open tennis championships on Sunday, Aug. 31, 2025, in New York. AP

“So sorry for Marketa after all she’s been through,” Sabalenka wrote on her Instagram Story after the news broke that their match at Arthur Ashe Stadium would not be taking place. “She has been playing amazing tennis and I know how badly this must h

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