's-Hertogenbosch, The Netherlands (Sports Network) - Kim Clijsters withdrew from her scheduled semifinal match at the Unicef Open on Friday because of an abdominal strain.

Urszula Radwanska was the Belgian star's opponent on Friday and will receive a walkover into the final.

Clijsters apparently was hurt during her quarterfinal match against Francesca Schiavone on Thursday.

"We went to the hospital in 's-Hertogenbosch, where an irregular fiber structure has been established," said trainer Sam Verslegers in a statement on Friday. "In view of Wimbledon we have made a safe decision."

Clijsters is headed to Wimbledon next week and has drawn Jelena Jankovic in her first-round match at the All England Club.

"Some days of rest will encourage much, perhaps even full recovery," added Verslegers. "I think she will be able to go at full force in a few days."

The four-time Grand Slam champion was playing her first tournament since a third-round exit at the Sony Ericsson Open in March. She skipped the European clay-court season, including the French Open, to prepare for the grass-court campaign that includes Wimbledon and the Olympics.

Clijsters has said the 2012 season will be her last, as she intends to retire after the U.S. Open later this summer.