World number one Dustin Johnson surged to an eight-shot victory with a sterling performance at the Sentry Tournament of Champions.

The American closed with an eight-under-par 65 to take the title by a sizeable margin from closest competitor Jon Rahm in Hawaii.

The 33-year-old followed up rounds of 69, 68 and 66 by taking four birdies on the front nine, and a back nine which included an eagle on the par-four 12th.

Johnson got a great roll from his 430-yard tee shot to land within inches of the pin and tapped in for two, with the only blemish on his Sunday card coming on the par-three 11th.

Spain's Rahm carded a 69 in his final round to edge out American Brian Rahman (72) in second, with Japan's Hideki Matsuyama tied for fourth after getting an eagle and two birdies in the last four holes.

Australian Marc Leishman, who was the joint leader at the halfway stage but carded a 76 on Saturday, finished tied for seventh on 13 under, while Jordan Spieth was a shot behind and finished ninth.