Woods began the final round seven shots clear of the field at Firestone Country Club after following his stunning 61 on Friday with a 68 on Saturday.
And the world number one was content to simply do enough to claim the win which takes him within three of Sam Snead's all-time record of 82, carding a closing level-par 70.
At 15 under, Woods finished seven shots clear of defending champion Keegan Bradley and Sweden's Henrik Stenson, his 18th win in 42 World Golf Championship events giving him the first prize of 1.4million US Dollars and taking his career earnings in WGC tournaments to more than 25million US Dollars.
"I don't know what it is, it just fits my eye," the 37-year-old said of his record at Firestone. "Just because it fits your eye it doesn't meant you're going to play well, but for some reason it just comes out and I have put it together.
"Today [Sunday] I was conservative, just trying to make pars. I figured the highest score I could shoot was 70 and that would force the guys to shoot 63 or 62 and I just felt this was a perfect day to protect.
"The conditions were blustery and tough and it was hard to shoot a low number but it was easy to shoot a number around par."
Woods now has five wins this season but the last of his 14 major titles remains the 2008 US Open.
Asked about the US PGA Championship at Oak Hill next week, he added on CBS: "I'm really looking forward to it. I feel like my game is pretty consistent. That's one of the things I've noticed this year is that I have hit it pretty good most of the year and weeks I've putted well I've been able to win so it's been pretty good so far."
Woods carded just one birdie and one bogey in the final round, opening with nine straight pars before holing from seven feet on the 10th. His sole dropped shot came when he three-putted the 14th.
Bradley set the nominal clubhouse target with a closing 67, while Stenson matched the 70 of playing partner Woods with 16 pars, one bogey and a crucial birdie on the 17th.
The former Ryder Cup player has now finished third, second and second in his last three events, the middle of those being runner-up to Phil Mickelson in the Open at Muirfield.
England's Chris Wood, making his debut in the event, finished in a tie for seventh on five under after a closing 71, while compatriot Luke Donald faded after two birdies in his first three holes to end up ninth.
Ryder Cup hero Martin Kaymer carded the joint lowest round of the day with a 66, the former world number one recovering from an opening 74 with three rounds in the 60s to finish four under alongside Donald.
World number three Rory McIlroy, seeking to rediscover top form ahead of the defence of his US PGA title next week, carded a closing 72 to finish two over.