Arnold Palmer Invitational presented by Mastercard: In his first start in the Arnold Palmer Invitational presented by Mastercard since his win in 2013, finished T5 after a final-round 69. Was five strokes back of leader Henrik Stenson after 54 holes, and got to within one of the lead with three holes to play, but posted back-to-back bogeys at Nos. 16 and 17. Improved to 118-under par at the Arnold Palmer Invitational, 44 strokes better than the next best player (Vijay Singh, 74-under). Marked his 10th top-10 (eight wins) in 18 starts at the event.
AT&T National: Surpassed Nicklaus on all-time PGA TOUR victories list, with his 74th, at the AT&T National, his second win at Congressional CC. Trails only Sam Snead's 82 PGA TOUR victories. Overcame a one-stroke deficit of 54-hole leader Brendon de Jonge, posting a final-round 69 to edge runner-up Bo Van Pelt by two strokes. Two-time FedExCup champion moved to No. 1 in the FedExCup standings for the first time in 100 weeks with his third victory of the campaign, the 12th time in his TOUR career he has compiled at least three wins in a season.
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.