Phil Mickelson matched Woods with a 71. Mickelson vowed to focus more on golf this time after taking advantage of the resort's numerous amenities with his family last year and missing the cut.
"I didn't play that bad (Thursday)," Mickelson said. "But I made some mistakes there that were just a little sloppy."
Simpson, J.B. Holmes, Andres Romero and Garth Mulroy shot 65. K.J. Choi was among a group of seven at 66.
Stallings birdied his final three holes Thursday for a 67.
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