LINZ, Austria (AP) _ Mary Pierce ruptured a cruciate ligament in her left knee in the Generali Ladies tournament and will undergo surgery.

Pierce led Vera Zvonareva 6-4, 6-5 Thursday and held three match points when she fell behind the baseline. She was carried off the court on a stretcher.

Pierce has left the hospital and plans to undergo treatment in France, a hospital spokesman said Friday.

The two-time Grand Slam champion has played only eight events this year because of right foot injuries.