Buick Open: Second-round, 9-under-par 63 led to a win at the Buick Open, his 33rd career title and 20th different tournament triumph. Led after both 36 and 54 holes. Has won 25 of 27 events when he was the 54-hole leader/co-leader. Entered the final round one stroke ahead of Esteban Toledo. Carded a 2-under 70 to secure a four-stroke victory over four players.
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. 
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