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Australian Adam Scott captured the WGC Invitational by four shots after a commanding final round of 65 in Ohio.

The 31-year-old had a bogey-free round to finish at 17 under, ahead of Rickie Fowler, who shot a 66, and world number one Luke Donald, also round in 66.

Rory McIlroy carded a 67 to share sixth at 10 under, Lee Westwood was one more back after a fine 65 and Scot Martin Laird's 72 left him joint 11th.

Tiger Woods was wayward off the tee but tied for 37th at one over after a 70.

"I was hitting it great then all of sudden I absolutely lost it but I got it back at the end," said Woods, who had three successive birdies on the back nine at the end of his first tournament for 12 weeks following injury.

"I've just got to keep playing. It's just something that comes over time of just playing and getting the feel for it."

For his former caddie Steve Williams, it was a remarkable eighth victory at the event, having been in the employment of Woods for seven between 1999 and 2009.

Scott started the final round one clear of playing partner Ryo Ishikawa, bidding to become the youngest winner on the PGA Tour for exactly 100 years.

The 19-year-old peppered the flags in the early stages and a third of the way through the round he had picked up three birdies to tie the lead with Scott at 13 under.

The teenager dropped his second shot of the day, however, when he failed to get up and down from the fringe, while playing partner Scott was content to play conservatively and secure pars.

Donald, who began the day three shots off the pace, birdied the opening hole from four feet but missed successive birdie putts from inside eight feet at the eighth and ninth.

But at the 10th he holed from the back edge of the green to move within two of Scott's lead, before missing another birdie opportunity from around the 10 feet range at the par-three 12th.

Donald kept his hopes alive with a birdie from close range at the 13th but Scott moved two clear of the field at 15 under by holing a superb chip from the fringe to birdie the 12th.

Westwood, who began the final day eight shots adrift, pitched to within a foot at the 12th for his fourth birdie of the day, before finishing nine under.

McIlroy, who dropped a shot at the first hole, finished one better, squandering the chance of a fifth birdie when he missed from three feet at the last.

Having played a delightful escape from the bunker at the 14th, Donald missed from four feet for par and Scott soon rolled in a 15-footer at that hole with his trusty long putter to open a three-shot advantage.

Fowler, still seeking his first PGA title, began and ended his round with birdies to share second with Donald, who regained his putting touch to birdie two of the closing three holes.

As Ishikawa bogeyed the last to drop to fourth with Jason Day, who finished second at both the Masters and US Open this year, Scott fittingly holed from six feet for his fourth birdie on the back nine and celebrated his first title since the Singapore Open in November last year.