Surgery: Announced on Wednesday, June 18, two days after winning the U.S. Open, that he would have reconstructive surgery on the anterior cruciate ligament in his left knee and miss the remainder of the 2008 season. Also announced that pain in his leg during the U.S. Open resulted from a double stress fracture to his left tibia, which he suffered while rehabilitating the knee. Surgery was performed on Tuesday, June 24 in Park City, Utah, by Dr. Thomas D. Rosenberg and Dr. Vernon J. Cooley, who did arthroscopic surgery on the same knee in April.
World Golf Championships-Mexico Championship: Collected his first top-10 of the season with a T10 at the World Golf Championships-Mexico Championship. Marked his 13th career top-10 finish in the event and 34th in World Golf Championships events. Second-round 66 at Club de Golf Chapultepec highlighted his competitive debut in Mexico. Four-putted the par-5 15th green and three-putted the par-4 16th green in the third round, marking the first time in his career he had four-putted and three-putted in back-to-back holes, a stretch of 22,640 holes in stroke-play events before reaching the par-5 15th in the third round.
Ryder Cup: Made his sixth Ryder Cup appearance, but first as a Captain's Pick, where he was victorious in three of the four matches in which he was involved. With 16 World Golf Championships titles and 28 top-10 finishes in 32 starts, returned to Sheshan International GC in Shanghai to try and add the HSBC Champions title, the only World Golf Championships title he has yet to capture, to his resume. Twice a runner-up in three previous starts, made five birdies on his inward nine in the final round to shoot a 4-under 68, good for T6 honors.
Masters Tournament: Claimed fourth Masters title at age 29 years, 3 months and 10 days with sudden-death playoff victory over Chris DiMarco. Tied Arnold Palmer for second-most Masters victories, with four, two behind Jack Nicklaus. Recovered from a first-round 2-over-par 74 and took the 54-hole lead by three over DiMarco with rounds of 66-65. During that stretch of the third round, posted seven straight birdies (Nos. 7-13), matching Steve Pate's 1999 record birdie streak at Augusta National. Final round included chip-in on par-3 16th hole from behind the green that extended lead to two strokes and bogeys on two closing holes for a 1-under-par 71, tied with DiMarco at 12-under-par 276 total. Rolled in 15-foot birdie putt on first playoff hole to earn green jacket and re-claim the No. 1 position in the Official World Golf Ranking.
In the days and months following Woods' admission of multiple infidelities, several companies re-evaluated their relationships with him. Accenture, AT&T, Gatorade and General Motors completely ended their sponsorship deals, while Gillette suspended advertising featuring Woods. TAG Heuer dropped Woods from advertising in December 2009 and officially ended their deal when his contract expired in August 2011. Golf Digest suspended Woods's monthly column beginning with the February 2010 issue. In contrast, Nike continued to support Woods, as did Electronic Arts, which was working with Woods on the game Tiger Woods PGA Tour Online. A December 2009 study estimated the shareholder loss caused by Woods's affairs to be between $5 billion and $12 billion.
On December 2, following Us Weekly's previous day reporting of a purported mistress and subsequent release of a voicemail message allegedly left by Woods for the woman, Woods released a further statement. He admitted transgressions and apologized to "all of those who have supported [him] over the years", while reiterating his and his family's right to privacy. Over the next few days, more than a dozen women claimed in various media outlets to have had affairs with Woods. On December 11, he released a third statement admitting to infidelity and he apologized again. He also announced that he would be taking "an indefinite break from professional golf."