
On a roller-coaster final day at Gleneagles, the former Walker Cup amateur surpassed home hope Stephen Gallacher and Argentina's Ricardo Gonzalez on the first extra hole by holing from four feet for a winning birdie.
"The other two guys were a little unlucky with their putts and before you know it you have a four footer for the win," said Fleetwood, who carded a closing 70 after sharing the overnight lead with Gonzalez.
"God knows how I made contact. It all seemed to unravel really quickly.
"It's unbelievable. I have been up there a lot and not even had a top-five finish and all of a sudden you come away with a win.
"It just seemed to come a bit easier this week. I was nervous as hell on the first green but after that I was pretty calm. It was so tight, almost claustrophobic on the leaderboard; if you dropped a shot you went down 10 places."
Gallacher, whose participation had been in doubt due to a back injury, was philosophical after birdies on the 14th and 16th and an eagle on 18 had put him right in contention.
"I would have taken a play-off on Monday," he said.
"I was just happy to be playing to be honest. I actually hit the ball really really well. It was only the short irons I was struggling with, I could not really get into my posture.
"On the 18th I knew I needed to hole it (his eagle putt) to have a chance. It was a great putt, just a shame I could not do it again."

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