When his left knee buckled at last year's PGA Championship, Tiger Woods wouldn't admit he hurt himself. It was a little embarrassing considering the limp developed after his fist-pump celebration of a birdie on the eighth hole at Southern Hills. It would have been out of character for Woods, an athlete who trains as if he were in Delta Force, a man who has parachuted out of planes and loves running around Isleworth in Orlando with a weight vest in sweat-dripping heat, to admit to a weakness. "As far as hurting myself, no. All good," Woods said that day in Tulsa after winning his 13th major championship.

Woods seemed invincible at the time, at the height of his power both mentally and physically -- but when the story broke the Tuesday after the Masters that Tiger had had his third knee surgery since 1994, it came as a shock in several ways. Although it is true Woods limped at times in tournaments during last year's PGA Tour Playoffs and took a long time getting out of the bunker on the fourth hole during the final round at Augusta National two weeks ago, few suspected anything significant. The circle of people who knew Woods had elected to get his knee "cleaned up" was so small, several of Woods' closest advisors didn't know.