Jamie Donaldson was given a scare by Swede Mikael Lundberg but still led the Irish Open with seven holes to play at Royal Portrush.
Lundberg played the first 10 holes in a remarkable eight under par to charge from six behind to two in front, but then bogeyed the 16th and 18th.
He was nevertheless round in a joint best-of-the-week 65, but Donaldson had a hat-trick of birdies from the second and was two ahead himself before having his first bogey of the day after missing the green at the short 11th.
Joint third on 12 under, three behind, were Finn Mikko Ilonen, Scot David Drysdale, Spaniard Rafael Cabrera-Bellom, Paraguay's Fabrizio Zanotti and England's Anthony Wall, who came back from a triple bogey eight at the second with three birdies.
Donaldson, trying for his first win in 255 European Tour events, went two in front again with a five-foot birdie putt at the 12th, but Dubai Desert Classic winner Cabrera-Bello cut it back to one with his birdies at the 16th and 17th.
Cabrera-Bello had the chance to apply even more pressure on the long 17th, but instead he bogeyed it and Donaldson's birdie at the short 14th - the hole known as "Calamity Corner" - put him three clear.
He still had work to do, though, and Zanotti reduced the gap to two when he did birdie the 17th from over 25 feet.
Donaldson followed with a 10-footer for birdie on the 15th and at three clear his maiden title was in sight.
