Dunne reached the turn in five-under but then
suffered heavy pressure when McIlroy birdied five of the last
seven holes at Close House.
The 24-year-old Dunne did not buckle, though, and holed four
birdies of his own on the back nine to win by three shots on
20-under-par.
Dunne said: "It feels great. I feel like I've been up there a
few times and never put my foot down to win it. I have come
close, so it's nice to put the demon off my back and get my
first one."
McIlroy has now finished runner-up twice in 2017 and is facing
only the second winless season of his career.
The Northern Irishman said: "It was just nice to have a chance
to win a golf tournament. I think that was the big thing and the
more chances I have like that, I seem to play better."
Overnight leader Robert Karlsson finished third, four shots
back, after managing only a four-under 66 in the final round.
(Reporting by Matt Westby; Editing by Ken Ferris)
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