Lee-Ann Pace held her nerve on the final hole to win the Open de Espana in Madrid by a single stroke.
The South African, who shared the overnight lead with Celine Herbin of France, appeared to be cruising to victory when she carded four birdies in the opening seven holes to open a three-shot lead.
However, bogeys at nine and 12 - along with a two-over-par five at the 17th - reduced her advantage to just a single stroke by the team she reached the final tee.
But a rock solid par at the 362-yard closing hole took her to victory thanks to a closing one-under-par 71 at Club de Campo Villa de Madrid.
It was her second Ladies European Tour title of the year and seventh of her career.
Sweden's Mikaela Parmlid offset four birdies with two bogeys for a 70, to finish alone in second spot.
Joanna Klatten of France was third, four shots off the pace, while her compatriot Herbin suffered a dismal back nine to finish fourth.
Herbin, who had teed off on Sunday on the back of three 68s, closed with a 76 after covering the final seven holes in four over par.