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.
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Farmers Insurance Open: In his season debut on the PGA TOUR, became the first player in TOUR history to win on the same course eight times with his Farmers Insurance Open victory at Torrey Pines GC. The win marked the sixth time on TOUR he has won in his season debut. His seventh Farmers Insurance Open win came five years after his U.S. Open win at Torrey Pines. At 14-under 274, won by four strokes over defending champion Brandt Snedeker and Josh Teater. He converted the 54-hole lead into victory for the 50th (of 54) time. With the win, the Farmers Insurance Open became the third event in which he has won seven times, the World Golf Championships-Bridgestone Invitational and Arnold Palmer Invitational being the others. In the previous six years he has won this event, he has gone on to win at least four times in each of those years. His 75th TOUR victory is just seven shy of the all-time record of 82, held by Sam Snead.
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.
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.