The 2018 Ryder Cup star entered Sunday's fourth round with a four-shot lead and, while an early wobble saw that wiped out, he eagled the 8th and came home in 33 to sign for a 67 and a 27-under-par total as all his rivals faltered.

Fellow Dane Rasmus Hojgaard was his nearest challenger after a 69, one shot clear of Frenchman Frederic Lacroix.

Olesen is likely to play much of his golf in the United States this season after securing his PGA Tour card by finishing ninth on last year's Race to Dubai.

But the UAE resident elected to tee it up in Ras Al Khaimah this week rather than at the Farmers Insurance Open, and was rewarded with a convincing victory.

"It was still a battle out there, it got close and you've got one of the most solid players (Hojgaard) right behind you so I knew it was going to be tough and we were tied for the lead very quickly," he said.

"I played some nice golf coming in and holed the right putts at the right time.

"To win was a goal and it was nice to get that here, especially being here at my new home. It's always a place I like to come to, not just for golf but for holidays. It's a great place and I'm really happy that I could get a win here."

Olesen birdied the 1st but a poor tee-shot on the 2nd led to a double bogey and, while he birdied the 3rd from 36 feet, so did Hojgaard after also picking up a shot on the 1st.

Hojgaard then made further gains on the 5th and 7th to join the lead but he hit a shank and made a bogey on the 8th, where Olesen put his second to six feet to set up an eagle and a three-shot lead.

Hojgaard could then only play the back nine in level par and Olesen birdied the 10th, 14th and last to storm to victory.

Lacroix finished third on 20-under after a 68.

Jason Scrivener, the only Australian to make the cut, had a final-round 70 to end up at nine-under, tied in 47th place overall.