Tsonga, Koubek, Knapp withdraw from Olympics with injuries

LONDON -- Australian Open finalist Jo-Wilfried Tsonga, Stefan Koubek and Karin Knapp have withdrawn from the Olympic tennis tournament because of injuries on Tuesday.

The 23-year-old Tsonga, who lost to Novak Djokovic in the Australian Open final, is still undergoing physical therapy following a knee operation, according to the French tennis federation.

"In agreement with Bernard Montalvan, doctor for the French team, Jo-Wilfried Tsonga believes he is not ready to participate in the games," the French federation said in a statement.

Tsonga will be replaced by Michael Llodra for the tennis tournament at the Beijing Games.

The 31-year-old Koubek has a back injury and will be replaced by Chris Guccione of Australia in the men's singles competition, with Mara Santangelo replacing her 21-year-old Italian teammate in the women's singles.

Knapp hasn't played since losing to Maria Sharapova in the third round of the French Open.