Woods says he'll retire when he can no longer compete

Tiger Woods says he'll know when it's time to walk away from golf.

"I won't have a problem with that," he said Tuesday in an interview on The Scott Van Pelt Show on ESPN Radio. "When I get to a point where my best is not good enough anymore, as I prepare and I practice and I get ready, and I know if I go out there and play the way I know I can play and it's just not good enough anymore, my skills have diminished that far, it's time for me to move on, rack the cue and go home."

Woods, who had reconstructive knee surgery the week after his U.S. Open win at Torrey Pines in June, was asked about retirement in the wake of Brett Favre's situation in Green Bay. He said individual sports are different from team sports when it comes to hanging it up.

"In an individual sport, when your skills have diminished, you have no one for backup," Woods told Van Pelt. "That's one of the reasons why I truly admire what [tennis player] Pete Sampras did. He won the U.S. Open and he was done."

As for coming back to golf, Woods said he is riding a stationary bike as part of his rehabilitation from his knee injury. He didn't set a timetable for his return, but said, "It's getting better. I'm finally able to start doing some rehab, start moving this thing around. It's been nice to be active again."

Woods told Van Pelt he didn't watch much of the British Open, only saw highlights of the Bridgestone Invitational last weekend (an event Woods has won six times) and he likely won't sit down to watch the PGA Championship this week.

"I probably won't watch any of this one," he said. "This one's a little more frustrating for me. I'm two-time defending [champion] and not being able to get out there and defend something I've already defended once and can't do it twice, it's a little bit frustrating."