Woods continued to excel in 2007 and the first part of 2008. In April 2008, he underwent knee surgery and missed the next two months on the tour. Woods returned for the 2008 U.S. Open, where he struggled the first day but ultimately claimed a dramatic sudden death victory over Rocco Mediate that followed an 18-hole playoff, after which Mediate said, "This guy does things that are just not normal by any stretch of the imagination," and Kenny Perry added, "He beat everybody on one leg." Two days later, Woods announced that he would miss the remainder of the season due to additional knee surgery, and that his knee was more severely damaged than previously revealed, prompting even greater praise for his U.S. Open performance. Woods called it "my greatest ever championship." In Woods' absence, TV ratings for the remainder of the season suffered a huge decline from 2007.
Arnold Palmer Invitational presented by MasterCard: Carded a final-round, 2-under 70 on a Monday finish to defeat Justin Rose by two strokes at the Arnold Palmer Invitational, winning the event for a PGA TOUR record-tying eighth time (Sam Snead at the Greater Greensboro Open). His 77th career PGA TOUR win moved him within five wins of all-time leader Snead's 82 victories. With wins at the Cadillac Championship and Arnold Palmer Invitational, he won in back-to-back starts for the first time since the 2009 Buick Open and World Golf Championships-Bridgestone Invitational. Supplanted Rory McIlroy for the No. 1 position in the Official World Golf Ranking. The last time he held the top spot was on October 30, 2010. Surpassed Ernie Els for most weeks in the top 10 of the Official World Golf Ranking, at 789. Had a record run of 736 consecutive weeks in the top 10 from April 13, 1997, to May 15, 2011. Returned to the top 10 on March 25, 2012, where he has since remained. Of his eight Arnold Palmer Invitational wins, has entered the final round with at least a share of the 54-hole lead seven times. Made his 17th start at the Arnold Palmer Invitational, with his lone missed cut coming as an amateur in his first start, in 1994. He has played in every event at Bay Hill since, with the exception of 2010.
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.
The year 2013 would bring a return of Woods' dominating play. In January, he won the Farmers Insurance Open by four shots for his 75th PGA Tour win. It was the seventh time he had won the event. In March, he won the WGC-Cadillac Championship, also for the seventh time, giving him his 17th WGC title and first since 2009. Two weeks later, he won the Arnold Palmer Invitational, winning the event for a record-tying 8th time. The win moved him back to the top of the world rankings. To commemorate that achievement, Nike was quick to launch an ad with the tagline "winning takes care of everything".
On February 19, 2010, Woods gave a televised statement in which he said he had undertaken a 45-day therapy program that began at the end of December. He again apologized for his actions. "I thought I could get away with whatever I wanted to," he said. "I felt that I had worked hard my entire life and deserved to enjoy all the temptations around me. I felt I was entitled. Thanks to money and fame, I didn't have to go far to find them. I was wrong. I was foolish." He said he did not know yet when he would be returning to golf. On March 16, he announced that he would play in the 2010 Masters.
After a slow start to 2014, Woods sustained an injury during the final round of the Honda Classic and was unable to finish the tournament. He withdrew after the 13th hole, citing back pain. He subsequently competed in the WGC-Cadillac Championship but was visibly in pain during much of the last round. He was forced to skip the Arnold Palmer Invitational at the end of March 2014, and after undergoing back surgery, he announced on April 1 that he would miss the Masters for the first time since 1994. Woods returned at the Quicken Loans National in June, however he stated that his expectations for the week were low. He would struggle with nearly every aspect of his game and miss the cut. He next played at The Open Championship, contested at Hoylake, where Woods had won eight years prior. Woods fired a brilliant 69 in the first round to put himself in contention, but shot 77 on Friday and would eventually finish 69th. Despite his back pain, he played at the 2014 PGA Championship where he failed to make the cut. On August 25, 2014, Woods and his swing coach Sean Foley parted ways. In the four years under Foley, he won eight times but no majors. He had previously won eight majors with Harmon and six with Haney. Woods said there is currently no timetable to find a replacement swing coach.
Earned his 80th PGA TOUR victory and first since 2013, winning the TOUR Championship for the third time in his career to move within two of Sam Snead's TOUR-best 82 victories. Finished the season No. 2 in the FedExCup, with runner-up finishes at the Valspar Championship and PGA Championship among his seven top-10s. Led the TOUR in Strokes Gained: Approach the Green (0.938) for the sixth consecutive season in which he played the minimum number of rounds. After originally being selected as a Captain's Assistant for the United States Ryder Cup team, was later selected as a captain's pick and played in the event for the eighth time.
Farmers Insurance Open: In his first official PGA TOUR start in over a year, carded rounds of 72-71-70-72 to finish T23 at the Farmers Insurance Open, his 17th start in the event. Marked his first time playing the weekend at Torrey Pines since 2014, with a WD and missed cut in 2015 and 2017, respectively. Stats for the week included: 17 of 56 fairways, 42 of 72 greens in regulation and 110 putts.
Wells Fargo Championship: With his best score of the week a 3-under 68 in the third round, finished T55 in his first start at the Wells Fargo Championship since 2012. Failed to record a birdie in the final round (3-over 74). It was the 11th time in his career as a professional where he failed to post a birdie in a round, and the first time since the final round of the 2014 World Golf Championships-Mexico Championship (at Doral).
the Memorial Tournament: Birdied the last two holes to shoot a final-round 65 and win the Memorial Tournament for the fourth time, beating Jim Furyk by one stroke. Trailed by four strokes entering the final round. Hit all 14 fairways in the final round and recorded his 20th come-from-behind victory in his 67th career victory. Chipped in for eagle from behind the green on the par-5 11th hole and was tied with Furyk, Jonathan Byrd and Davis Love III at 10-under with two holes remaining before his final surge.
Won seven times en route to capturing the inaugural FedExCup, cruising through the PGA TOUR Playoffs for the FedExCup with two wins and a T2 in three starts. Captured 13th career major championship (second all-time to Jack Nicklaus' 18) and finished the year with 61 official PGA TOUR victories, fifth all-time. Adjusted scoring average was 67.79, matching own record set in 2000. With 60 official rounds, won his seventh career Vardon Trophy and also captured the Byron Nelson Award.