The Open Championship: Finished T6 at the 147 Open Championship at Carnoustie, his first top-10 in a major since at T6 at the 2013 Open Championship. Week was highlighted by a third-round 66, his lowest round in a major since a 66 in the second round of the 2011 Masters. Was just his second made cut (2018 Masters Tournament/T32) in his last six major starts. Posted rounds of 71-71-66-71, the first time since the 2010 Masters Tournament (T4) he recorded four par-or-better rounds in a major. Paired with eventual-champion Francesco Molinari, entered the final round four shots off the lead. Took the solo-lead at 7-under after nine holes, one ahead of Molinari and Jordan Spieth, but his lead disappeared with a double bogey at No. 11. Bogeyed No. 12 and birdied No. 14 before closing with four pars to finish at 5-under. The finish moved him to No. 50 in the Official World Golf Ranking, returning to the top 50 for the first time since January 2015. The ranking also earned him a spot in the World Golf Championships-Bridgestone Invitational.
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).
Arnold Palmer Invitational presented by MasterCard: Birdied the 72nd hole to beat Sean O'Hair by one stroke and claim his sixth Arnold Palmer Invitational presented by MasterCard. Sank a 15-foot birdie putt on the final green, duplicating his last-putt heroics from two previous years (2001, 15-foot birdie putt to beat Phil Mickelson; 2008, 24-foot birdie putt to beat Bart Bryant). Matched his largest comeback after 54 holes (five strokes) with his victory. He also came back from five strokes behind after 54 holes to win the 2000 AT&T Pebble Beach National Pro-Am (Mark Brooks and Matt Gogel). Out of 66 career wins, it was his 19th coming from behind. Became the first player to win six Arnold Palmer Invitational titles. The only other players with multiple victories at the event are Tom Kite (1982 and 1989) and Loren Roberts (1994-95).
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 returned to competition in April at the 2010 Masters, where he finished tied for fourth place. He followed the Masters with poor showings at the Quail Hollow Championship and the Players Championship, where he withdrew in the fourth round, citing injury. Shortly afterward, Hank Haney, Woods' coach since 2003, resigned the position. In August, Woods hired Sean Foley as Haney's replacement. The rest of the season went badly for Woods, who failed to win a single event for the first time since turning professional, while nevertheless finishing the season ranked No. 2 in the world.
Surgery: Pulled out of next two PGA TOUR starts, the Genesis Open and The Honda Classic. Released statement: "My doctors have advised me not to play the next two weeks, to continue my treatment and to let my back calm down. This is not what I was hoping for or expecting. I am extremely disappointed to miss the Genesis Open, a tournament that benefits my foundation, and The Honda Classic, my hometown event. I would like to thank Genesis for their support, and I know we will have an outstanding week." In April, announced on his website he had undergone further back surgery. The operation was performed by Dr. Richard Guyer of the Center for Disc Replacement at the Texas Back Institute.