Rhys Davies of Wales showed no signs of nerves after carding a closing 66 to win for the first time on the European Tour at the Trophee Hassan II in Morocco.
Davies, 24, overturned Louis Oosthuizen's two-shot overnight lead at Royal Golf Dar Es Salam with a seven under par round to claim the 230,000 Euro first prize on 25 under par.
The Challenge Tour graduate and former British Boys Amateur Champion first held his nerve during the final round to claw his way back on level terms with Oosthuizen and then moved comfortably clear of the South African, who finished with a round of 70.
"I'm a little bit lost at the moment. This is all completely surreal to me," said Davies.
"It's all a bit of a blur. I just kept focusing on hitting the ball as close to the flag as I could and holing every putt and I nearly did just about that.
"I just felt like I could make every putt and I think that was the key. I had a good speed on the greens and when you have a good speed you hole a lot of putts.
"I had good control of my swing today. It was probably the best I've hit it all week."
Thomas Levet of France, Spain's Ignacio Garrido, Finn Mikko Ilonen and South African Thomas Aiken shared third place after finishing five shots behind Davies.