Hoey, ranked No. 271, lost his three-shot overnight lead early in the final round but regrouped well, birdying three of the last four holes for a 4-under 68. His 22-under total broke the tournament record, set by Lee Westwood eight years ago, by one shot.
McIlroy’s closing 65 gave him second place ― two shots clear of McDowell (69) and Scotland’s George Murray (67), who finished tied for third.
Hoey’s third career title was worth $800,000. But it was the way he held off McIlroy and McDowell ― the last two U.S. Open champions ― that pleased him most.
“They are major champions … they have been my inspirations,” said Hoey, who has struggled to fulfill his potential after winning the British Amateur title in 2001.
“It’s taken me a long time to kick on. My belief has been high and low but I got my consistency back this week. … Winning the Dunhill Links, it doesn’t get much better.”
Hoey led or held a share of the lead after every round of this week’s prestigious pro-am played over three of Scotland’s best courses ― St. Andrews, Carnoustie and Kingsbarns.
“My short game’s been the best it’s ever been this week,” said Hoey, who had a 66 in each of the first three rounds.
This was the first-ever Northern Irish 1-2-3 at a European Tour event, just adding to the country’s strong run in the sport. McIlroy, McDowell and current British Open champion Darren Clarke each have won a major in the last 15 months.
McIlroy, seeking a fourth career win and first since the U.S. Open in June, began the day five shots back of Hoey. But he holed a wedge for an eagle at the par-4 No. 3, sparking a charge to the top.
After six holes, McIlroy, McDowell and Hoey were tied at 18 under overcast skies, and McIlroy pulled a shot clear after making birdies at Nos. 7, 9 and 11.
By that stage, he was closing in on the course record of 63 he set at the British Open last year. But the 22-year-old McIlroy failed to pick up a shot in his final seven holes and was run down by Hoey, his old playing partner in Belfast and someone he looked up to as a budding amateur.
“It’s good to see all us boys up there but I’m obviously disappointed it wasn’t me that’s lifting the trophy,” McIlroy said.
“But considering that I was 3 over after 11 holes in this tournament, I’ve come back and played some really good golf. I’ve still got a few tournaments left this year to try to get a win or two.”
Like McIlroy, the 15th-ranked McDowell only made one birdie on the back nine, with a host of putts slipping by the cup, but still left St. Andrews happy after finding his form following a poor summer.
“Great things are ahead for me. I’m much happier with my game,” McDowell said. “But when a guy plays like Michael played down the stretch, you can’t have any complaints. No one lost the tournament today, Michael just played fantastic.”