Tiger Woods announced Wednesday that he will undergo season-ending surgery on his left knee.

The world's top-ranked golfer said on his Web site that he will have reconstructive surgery to repair his ACL and will miss the rest of the PGA season. A date has not yet been set for the surgery.

The 14-time major champion will also require time off to repair a double stress fracture in his left leg. The stress fracture was discovered last month and caused him pain en route to winning his third U.S. Open title in a 19-hole playoff against Rocco Mediate.

"I know much was made of my knee throughout the last week, and it was important to me that I disclose my condition publicly at an appropriate time. I wanted to be very respectful of the USGA and their incredibly hard work, and make sure the focus was on the U.S. Open," Woods said in a statement on his Web site. "Now, it is clear that the right thing to do is to listen to my doctors, follow through with this surgery, and focus my attention on rehabilitating my knee."

PGA Tour commissioner Tim Finchem commented on Woods' injury Wednesday.

"The fact that he needs additional surgery only makes his performance and victory at last week's U.S. Open all the more impressive," Finchem said in a statement.

The U.S. Open marked Woods' first tournament since undergoing knee surgery on April 15 to clean out cartilage.

According to Woods' Web site, he first ruptured his ACL in 2007 when he was running near his Orlando home. Woods elected not to have surgery to repair the damage at that time and opted to instead play through the pain.

Woods rested his knee entering the 2008 season, but when the pain persisted he decided to have arthroscopic surgery to clean out cartilage damage that resulted from the ACL injury. At the time, Woods hoped that the April surgery would allow him to delay the ACL surgery until after the season.

"I would like to thank my fans and partners for their continual support and can assure everyone that I will be as dedicated to rehabilitating my knee as I am in all other aspects of my career," Woods said on his Web site.

Woods played in just seven tournaments in 2008, winning five times, including the U.S. Open. But for the first time in his career, Woods will miss a major championship when he skips next month's British Open and August's PGA Championship.

He will also be sidelined for September's Ryder Cup.

"I admire Tiger as a person, player and fan," U.S. Ryder Cup captain Paul Azinger said in a statement. "This should not be about Tiger and the Ryder Cup now. This is about Tiger's health and well-being and his march to history."