Matt Fitzpatrick took victory at the Andalucia Masters by three shots after fellow Englishman Laurie Canter relinquished an overnight lead and Sweden's Sebastian Soderberg faded late on.
Competing in his first event after finishing pointless at the Ryder Cup, Fitzpatrick carded a final round of 69, picking up shots on the 16th and 17th holes.
Those gains came just as Soderberg - who had moved into a two-shot lead in part thanks to an eagle on the par-five fourth - double-bogeyed the 17th, dropping into a share of second with Lee Min-Woo.
Canter, who began the day with a three-shot lead, had a miserable final round with a double-bogey on the par-three sixth and further dropped shots on the seventh, 12th, 16th and 17th holes.
Northern Ireland's Jonathan Caldwell finished 20 shots adrift of the summit in a tie for 65th after carding a 74 to finish on 14 over.
"It's on the bucket list to win a round at Valderrama with the history that it has. To do it bogey free on Sunday as well is extra special, I'm delighted," Fitzpatrick said after his victory.
"It's amazing, particularly the way I did it - very patient all day, didn't try to press anything, stuck to our targets and managed to hole the putts at the end.
"You can hit half decent shots and be behind a tree and you're chipping out or you've got to manoeuvre something. It's a true test and to be patient the whole 72 holes, I'm really pleased with the way my attitude was all week."