Hanson opened the final round with a one-stroke edge over McIlroy and had a 5-under-par 67 Sunday that was just enough to stay ahead of McIlroy, who also turned in a 67. He totaled 21-under 267 for the tournament. McIlroy was 20-under.
Luke Donald shot a final-round 66 and took third place at 17-under while Ian Poulter, with the round of the day at 7-under 65, climbed into fourth at 16-under. Shane Lawry had a 68 Sunday and was fifth another stroke back.
Hanson and McIlroy were paired together for the second consecutive day and Hanson pulled away due to a birdie at the second hole and bogeys at Nos. 4 and 5 by McIlroy.
The lead was four strokes going into the 15th, which Hanson birdied, but McIlroy had an eagle at the par-5 hole and came back with a birdie at 16. Hanson was in a bunker at 16 but saved par to keep a two-stroke edge.
McIlroy had pars at 17 and 18 and Hanson survived a plugged lie in the bank of a bunker at 18 for a two-putt bogey and the win.
Hanson had birdies at the par-5 13th and 15th for the fourth straight round. He was 13-under on the pars 5s for the week.
The BMW Masters is the sixth European Tour title for Hanson, who also won the KLM Open earlier this year.
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