Galvin Green's Lee Slattery won the Madrid Masters by one shot to claim his first European tour title.
The 33-year-old Englishman finished one under for the day and 15 under for the tournament to pip Italy's Lorenzo Gagli.
Slattery hit his third shot into the water on the 18th but despite the double bogey won for the first time in seven years on the tour.
"People have been telling me for years I can win and now I believe it, that has been the biggest problem and this [win] for me is huge."
European order of merit leader Luke Donald failed to retain his title, a final-round par leaving him eight under for the tournament.
Slattery held a two-shot lead going into the 18th but put his third shot into the water.
He regained his composure, pitching his fifth to within 15 feet and two-putted for a double bogey, which was enough to seal the victory.
"I had a two-footer on the last to win and I have never shaken so much in my life," he added.
"I was so relaxed on the back nine, making birdies, but as soon as I made a mistake, like I did on the last, it became quite tough.
"It was nerve-wracking."
The win secured Slattery’s tour card and eradicated any repeat of 2007 when he lost his tour card following 6 missed cuts in his last 11 events.
"It's more the belief," he said. "I have been out here for seven years and now I believe I can win."
The victory bagged Slattery $223,000 (£143,000).