Swiatek is one of five current or former top-10 players to have withdrawn from the Korea Open.

Jessica Pegula, the defending champion with a Korean-born mother, will miss her title defense here due to a rib injury. Pegula, world No. 3, knocked off Swiatek in the quarterfinals of the U.S. Open before losing to Aryna Sabalenka in the final.

World No. 4 Elena Rybakina, the 2022 Wimbledon champion, has hit the sidelines with a back injury, while eighth-ranked Emma Navarro, the U.S. Open semifinalist, has changed her schedule. Karolina Pliskova, former world No. 1 and 2014 Korea Open champion, is dealing with a foot injury.

With these withdrawals, the 2017 U.S. Open champion Sloane Stephens and the 2021 U.S. Open winner Emma Raducanu have moved into the main draw.

Raducanu was a fan favorite at the 2022 Korea Open, when she reached the semifinals — her first trip to the last four at a tournament that year.

The Korea Open starts Saturday with qualifying matches at Olympic Park Tennis Center in Seoul, and the main draw matches will begin Monday. The finals for both the singles and doubles will be Sept. 22.

The Korea Open has been elevated from WTA 250, the lowest level of tour events, to WTA 500, meaning the champion will earn 500 world ranking points. The purse has been raised from about US$260,000 to US$1 million.