Dustin Johnson retained his AT&T Pebble Beach National Pro-Am title in a wire-to-wire victory courtesy of a birdie at the 72nd hole.

The 25-year-old lifted his third PGA Tour title and second at Pebble Beach, sealing the win despite a final round 74 which completed a 16 under par total.

David Duval and JB Holmes were tied for second at 15 under, while Steve Marino was alone in fourth, two shots further back.

Johnson recorded scores of 64, 68 and 64 in the first three rounds to set up a final round shootout with Paul Goydos, with the duo four shots clear on 18 under.

But Goydos' challenge faltered and Johnson's was in danger of suffering the same fate.

The day began badly, with Johnson bogeying the par-four first before an eagle three at the sixth was cancelled out by a double bogey six at the ninth.

Further bogeys at the 12th and the 17th left Johnson in a three-way tie for the lead with Duval and Holmes and a play-off looming, but he coolly made a birdie four at the par-five 18th to finish on two over for the day and retain his title.

While Johnson survived a final round scare, the anticipated duel with Goydos did not materialise.

Goydos completed a six-over 78 to finish tied for fifth on 12 under, carding two birdies, four bogeys and a nine at the par five 14th which ended his challenge.

Duval carded six birdies and three bogeys in his three-under-par final round 69 and Holmes signed for a 71.