Buick Invitational: In first start of PGA TOUR season at the Buick Invitational, came from two strokes back in the final round to post seventh consecutive TOUR victory, dating back to the 2006 Open Championship. Victory was fifth career Buick Invitational triumph, his third event with five-plus victories (CA Championship and Bridgestone Invitational, both six times), and the 55th of his PGA TOUR career.
In October 2007, Gatorade announced that Woods would have his own brand of sports drink starting in March 2008. "Gatorade Tiger" was his first U.S. deal with a beverage company and his first licensing agreement. Although no figures were officially disclosed, Golfweek magazine reported that it was for five years and could pay him as much as $100 million. The company decided in early fall 2009 to discontinue the drink due to weak sales.
A related effect was measured by University of California economist Jennifer Brown, who found that other golfers scored higher when competing against Woods than when he was not in the tournament. The scores of highly skilled golfers are nearly one stroke better when playing against Woods. This effect was larger when he was on winning streaks and disappeared during his well-publicized slump in 2003–04. Brown explains the results by noting that competitors of similar skill can hope to win by increasing their level of effort, but that, when facing a "superstar" competitor, extra exertion does not significantly raise one's level of winning while increasing risk of injury or exhaustion, leading to reduced effort.
U.S. Open Championship: Posted a 5-under 66 during the third round of the U.S. Open to enter the final round five strokes behind tournament leader Dustin Johnson. Went on to card a 4-under 75 Sunday to finish T4 (his eighth top-10 at the U.S. Open and 34th top 10 in a major championship). It was the second-highest, final-round score in a major championship as a professional (76 at the 2004 U.S. Open; 75s at the 2009 PGA Championship, 2003 Masters, 1999 Masters and 1997 PGA Championship).
World Golf Championships-Cadillac Championship: Posted a final-round, 6-under 66 to finish T10 at the World Golf Championships-Cadillac Championship, his first top-10 of the season and best showing since a T4 at the 2010 U.S. Open. It marked the 11th time in as many starts that he has finished with a top-10 at the event and the eighth time in as many starts inside the top 10 at the TPC Blue Monster at Doral. The showing represented his best round on TOUR since a second-round, 6-under 65 at the 2010 Deutsche Bank Championship. Played the first three rounds with Phil Mickelson, the first time the two have been paired together for three rounds in a PGA TOUR-sanctioned event. The two have had 28 official pairings on TOUR and 29 counting the 2009 World Golf Championships-HSBC Champions.
Woods has spent the most consecutive and cumulative weeks atop the world rankings. He is one of five players (along with Gene Sarazen, Ben Hogan, Gary Player, and Jack Nicklaus) to have won all four major championships in his career, known as the Career Grand Slam, and was the youngest to do so. Woods is the only player to have won all four major championships in a row, accomplishing the feat in the 2000–2001 seasons.
In November 2006, Woods announced his intention to begin designing golf courses around the world through a new company, Tiger Woods Design. A month later, he announced that the company's first course would be in Dubai as part of a 25.3-million-square-foot development, The Tiger Woods Dubai. The Al Ruwaya Golf Course was initially expected to finish construction in 2009. As of February 2010, only seven holes had been completed; in April 2011, The New York Times reported that the project had been shelved permanently. In 2013, the partnership between Tiger Woods Design and Dubai Holding was dissolved.
On March 11, 2018, he finished one-shot back and tied for second at the Valspar Championship in Florida, his first top-five finish on the PGA Tour since 2013. He then tied for sixth with a score of five under par at the 2018 Open Championship. At the last major of the year Woods finished second at the 2018 PGA Championship, two shots behind the winner Brooks Koepka. It was his best result in a major since 2009 (second at the 2009 PGA Championship) and moved up to 26th in the world rankings. His final round of 64 was his best ever final round in a major.
World Golf Championships-Accenture Match Play Championship: Defeated Stewart Cink 8 and 7 in the 36-hole championship match to capture the World Golf Championships-Accenture Match Play Championship for the third time. The victory was his fourth straight on the PGA TOUR and the 63rd of his career, passing Arnold Palmer for fourth all-time in career PGA TOUR wins, one behind Ben Hogan.
Arnold Palmer Invitational presented by MasterCard: At the Arnold Palmer Invitational, earned his 72nd career PGA TOUR win, and his seventh Bay Hill tournament title, with a five-shot win over Graeme McDowell. After a second-round 65, he was tied with Charlie Wi for the 36-hole lead. Added a 1-under 71 Saturday to take a one-stroke lead over McDowell into the final round. After a bogey at the second hole Sunday, he reeled off birdies on Nos. 3, 4, 6 and 8 to take control. Had eight pars and a bogey on the back nine.
Ford Championship at Doral: Took over as World No. 1 for the first time since the week of Aug. 30, 2004 by defeating Phil Mickelson by a stroke at the Ford Championship at Doral. Paired with Mickelson in the final round for just the third time in his career, began the day two strokes behind. Caught up to Mickelson at the turn and took a two-stroke lead after an eagle on the par-5 12th hole. Mickelson birdied the next two and both bogeyed the 16th to remain tied with two holes to play. Birdied the 17th hole and when Mickelson's chip on No. 18 lipped out, earned the 42nd victory of his career.
Woods turned pro at age 20 in August 1996 and immediately signed advertising deals with Nike, Inc. and Titleist that ranked as the most lucrative endorsement contracts in golf history at that time. Woods was named Sports Illustrated's 1996 Sportsman of the Year and PGA Tour Rookie of the Year. On April 13, 1997, he won his first major, the Masters, in record-breaking fashion and became the tournament's youngest winner at age 21. Two months later, he set the record for the fastest ascent to No. 1 in the Official World Golf Rankings. After a lackluster 1998, Woods finished the 1999 season with eight wins, including the PGA Championship, a feat not achieved since Johnny Miller did it in 1974.
In 2011, Woods' performance continued to suffer; this took its toll on his ranking. After falling to No. 7 in March, he rebounded to No. 5 with a strong showing at the 2011 Masters, where he tied for fourth place. Due to leg injuries incurred at the Masters, he missed several summer stops on the PGA Tour. In July, he fired his longtime caddy Steve Williams (who was shocked by the dismissal), and replaced him on an interim basis with friend Bryon Bell until he hired Joe LaCava. After returning to tournament play in August, Woods continued to falter, and his ranking gradually fell to a low of #58. He rose to No. 50 in mid-November after a third-place finish at the Emirates Australian Open, and broke his winless streak with a victory at December's Chevron World Challenge.
Farmers Insurance Open: At the beginning of the year, committed to the Farmers Insurance Open, The Honda Classic and the Omega Dubai Desert Classic on the European Tour. Making his first start in an official PGA TOUR event for the first time since the 2015 Wyndham Championship (T10), opened the Farmers Insurance Open with a 4-over 76 on the South course, his highest score ever to start a year as a professional. Missed the 36-hole cut after a second-round 72 for a 4-over total.
Woods collaborated closely with TAG Heuer to develop the world's first professional golf watch, which was released in April 2005. The lightweight, titanium-construction watch, designed to be worn while playing the game, incorporates numerous innovative design features to accommodate golf play. It is capable of absorbing up to 5,000 Gs of shock, far in excess of the forces generated by a normal golf swing. In 2006, the TAG Heuer Professional Golf Watch won the prestigious iF product design award in the Leisure/Lifestyle category.