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.
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.