FINAL LEADERBOARD: (US unless stated)
-20 T Woods -17 J Senden (Aus), G Chalmers (Aus), R Thatcher -16 YE Lang (Kor), M Letzig Selected others: -13 J Leonard -11 J Furyk -11 G Owen (Eng)
Woods completed his 69th victory on the PGA Tour in Michigan
Tiger Woods produced an unblemished round to win his third Buick Open title by three shots at Warwick Hills.
Starting the last round one shot clear, Woods birdied the fourth, seventh and 16th holes and parred the rest for a three-under 69 to end on 20 under.
Roland Thatcher notched eight birdies in a 64 to jump into a tie for second with Australians Greg Chalmers (68) and John Senden (70) on 17 under.
Michael Letzig, who began the day one shot behind Woods, fell away with a 73.
The victory was Woods' 69th on the PGA Tour - only Sam Snead (82) and Jack Nicklaus (73) have won more - and it never looked in doubt after he birdied the fourth and seventh to turn in 34.
There was a brief moment of concern when the 33-year-old dumped his ball in the green-protecting lake on the 13th when he over-cooked an ambitious attempt to cut his ball round a tree.
However, it was a par five and the world number one flipped a wedge to within four feet to save his par.
Letzig, playing with Woods, birdied the 13th, but his challenge had already faded with a double bogey at the par-three eighth and he dropped a shot at the last to finish on 15 under par.
Senden enjoyed a run of three successive birdies midway through his back nine but he will be cursing three dropped shots in the first 11 holes.
Victory for Woods will go some way towards making up for the disappointment of missing the cut - only the second time he has done so at a major - at the Open two weeks ago.