Zach Johnson (69) tied for second -- his best finish this year -- at 20 under.
Singh is the first three-time champion at the Buick Open, a tournament that started in 1958. He's also the first repeat champion since Tony Lema in 1965. The 42-year-old Fijian has won four events this year and 28 in his career. Singh trails only Woods' 44 victories and leads Phil Mickelson by two among active US PGA Tour players.
Singh's five-shot lead was his largest entering a final round. The four times he led by three after 54 holes, he won each event, including the 2000 Masters.
The large cushion allowed him to play conservatively, making two birdies and 16 pars.
Singh matched the Buick Open's 54-hole record of 22-under 194.
"You never win the golf tournament on Saturday, but you can put yourself in position to win," he said.
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