The Open Championship: Earned 10th professional major title at The Open Championship at age 29 years, 6 months and 17 days in his 35th major as a professional. Posted rounds of 66-67-71-70–274 at St. Andrews to defeat nearest challenger Colin Montgomerie by five strokes. The youngest and quickest to win each of the four major championships twice. Jack Nicklaus was the first to accomplish the feat at 31 years, 1 month and 7 days when he won his second PGA in 1971 in his 37th major as a professional. Sixth player in The Open Championship history to win in wire-to-wire fashion–Ted Ray (1912), Bobby Jones (1927), Gene Sarazen (1932), Henry Cotton (1934) and Tom Weiskopf (1973).
PGA Championship: Won 12th major at the PGA Championship at Medinah CC, moving into solo second behind Jack Nicklaus (18) on the career majors list. First player to win two PGAs at the same course (1999 and 2006). Recorded four rounds in the 60s (69-68-65-68) for just the second time in a major (2000 Open Championship). Tied the tournament record which he set with Bob May in 2000 (18-under 270). Became the 29th player in major championship history to collect two major wins in the same year, this being his fourth time.
Ryder Cup: Made his sixth Ryder Cup appearance, but first as a Captain's Pick, where he was victorious in three of the four matches in which he was involved. With 16 World Golf Championships titles and 28 top-10 finishes in 32 starts, returned to Sheshan International GC in Shanghai to try and add the HSBC Champions title, the only World Golf Championships title he has yet to capture, to his resume. Twice a runner-up in three previous starts, made five birdies on his inward nine in the final round to shoot a 4-under 68, good for T6 honors.
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.