“Marketa Vondrousova has withdrawn from the US Open women’s singles event with an injury,” tournament organisers said in a statement.

“Aryna Sabalenka advances to the women’s singles semi-finals via walkover.”

World No 1 Sabalenka plays fourth-seeded American Jessica Pegula in the last four Thursday in a repeat of last year’s final won by the Belarusian.

“So sorry for Marketa after all she’s been through. She has been playing amazing tennis and I know how badly this must hurt for her,” Sabalenka wrote on social media.

The 26-year-old Vondrousova had reached her second US Open quarter-final after knocking out two top-10 players in New York.

She took down seventh seed Jasmine Paolini in the third round and defeated Elena Rybakina in the last 16 in a battle of former Wimbledon champions.

But injury struck the unfortunate Vondrousova once again during a practice session Tuesday. Footage of the session aired by ESPN showed Vondrousova doubled over and being consoled by members of her coaching team. The nature of the injury was not immediately clear.

Vondrousova missed last year’s US Open after undergoing shoulder surgery on the eve of the tournament. She also sat out the Australian Open in January.

The Czech returned briefly in February but then did not play again for three months before the French Open.