American Chris DiMarco shot a final-round 67 to claim victory in the inaugural Abu Dhabi Golf Championship.
GB&Ire unless stated
-20 C DiMarco (US)
-19 H Stenson (Swe)
-18 S Garcia (Sp)
-17 R Gonzalez (Arg)
-15 MA Jimenez (Sp)
-17 C Montgomerie
-10 I Poulter
-2 P Casey
-2 N Dougherty
The 35-year-old New Yorker, who trailed Swede Henrik Stenson by one shot overnight, fired four birdies and an eagle to finish on 20 under par.
Stenson held on to seal second place after carding a fine 69, while Spain's Sergio Garcia was one shot back ahead of Argentina's Ricardo Gonzalez.
The win ended a four-year barren run in tournament golf for DiMarco.
The American started his round with a birdie and an eagle to turn his one-shot deficit to Stenson, who opened with two pars, into a two-shot lead.
Stenson, Miguel Angel Jimenez, Garcia and Gonzalez all made charges, but DiMarco held his nerve as swirling wind made conditions difficult.
With his lead having been cut to one, DiMarco gave himself breathing space with a birdie on the 16th to move two shots clear.
And despite a last-hole birdie from Stenson, DiMarco held firm with pars at 17 and 18 to ensure his first win since 2002.
The only drawback for DiMarco was that the £188,000 top prize did not count towards the US Ryder Cup race as it was a European Tour event, the first he has entered that was not co-sanctioned by the PGA Tour.
"I could have played in America this week so I guess I made the right choice to come here," said DiMarco, whose wife Amy caddied for him.
"It's a big monkey off my back to win here - four years since my last and I'm just relieved.
"It was great to be able to walk up the 18th with a chance to win the tournament with her on the bag.
"One of my brothers caddies and he couldn't do it, so on a whim a month ago I just said 'Why don't you caddy?'
"To have her on the bag when I won is unbelievable, it's great for us as a couple to be able to experience that. I owe a lot this week to her.
"The last time she caddied for me was seven or eight years ago and I was a very mediocre player back then. She agreed I've got a lot better. But I think she's done with caddying now."
India's Jyoti Randhawa fired the day's best score - a seven-under-par 65 - to finish in a tie for sixth with Britain's Colin Montgomerie, whose 70 put him on 275.
Monty's challenge never got off the ground on Sunday and he wound up seven shots adrift.
World number two Vijay Singh, Montgomerie's playing partner, finished at 11 under, tied with South African Charl Schwartzel.