Toms shot a 5-under 65 in the final round to end the tournament at 19-under-par 261 and earn his 12th career title on the PGA Tour. The 2001 PGA Champion set a Waialae Country Club course record with a 9-under 61 in Saturday's third round and was tied with Chad Campbell for the overnight lead.
Rory Sabbatini joined Campbell at minus-14 after carding the best round of the day, a bogey-free 62. Sabbatini was one of a handful of players to put together scores deep into the red numbers, but Toms was without a real challenger for most of the round.
Bubba Watson, a PGA Tour rookie, consistently thrilled the gallery with his long drives and odd lines off the tee on the way to a 5-under 65. He finished alone in fourth place at 12 under and provided a neat sideshow for what turned into a rout for Toms.
Toms picked up $918,000 for his first victory since winning the WGC-Accenture Match Play Championship last February. He has won at least one tournament in four straight seasons, and in seven of the last 10.
It was also Toms' third top-10 finish since falling ill during the first round of the 84 Lumber Classic last September, when he was hospitalized for one day and diagnosed with a rapid heart rate.
At No. 1, Toms knocked his second shot within 10 feet to set up a birdie and move one shot clear of Campbell. It was just one of nine birdies recorded at the first hole in the final round.
Toms parred the second and then made a 20-foot birdie putt at the third to move to 16 under for a two-shot lead over Campbell.
The lead remained two strokes until Campbell bogeyed the par-5 eighth to fall three shots off the pace. With Toms playing so consistently, it was all but over after that, but the leader added back-to-back birdies at the ninth and 10th to move five clear of his playing partner.
An attempt at a bogey-free round was foiled for Toms when he dropped a shot at the par-4 13th -- his first bogey since the second round. But he rebounded by curling in a birdie putt at 14th to get back to 18 under.
Toms then finished off his round with another birdie at 18 after coming up just short on an eagle putt from the fringe.
For the 39-year-old Toms, it was the eighth time in 10 tries that he entered the final round with at least a share of the lead and came out with a victory. He has won seven straight tournaments when holding at least part of the lead after 54 holes.
Campbell, on the other hand, has lost four times in five chances with at least a share of first place heading into the last round.
Australian Nathan Green shot a 6-under 64 and finished alone in fifth place at minus-11. Vijay Singh, the 2005 champion, was two shots further back in sixth after a final round 66.
Stuart Appleby, who won his third straight Mercedes Championships last weekend, shot a 67 and shared seventh place at 8-under with Jim Furyk (68) and Charles Warren (68).
David Duval, the 2001 British Open champion and much-maligned former world No. 1, turned in one of the best rounds of the day with a 7-under 63. He tied for 31st place at minus-2.