Britain's Laura Davies finished second at the LPGA Thailand tournament in Pattaya following a late charge.
Pettersen was given a scare by Davies' tremendous charge
She fired a superb seven-under-par 65 to whittle away Suzann Pettersen's seven-stroke lead but the Norwegian made an eagle at the last to triumph.
Davies' round included six birdies and an eagle at the first and she was tied with Pettersen, who made four bogeys in her round of 71, on the final fairway.
The Briton birdied the 18th to end with a final total of 267 and 20 under par.
"She made a great shot on the last and that was it," said the 44-year-old Davies about the last-hole drama.
"It was all about that one shot. She hit the shot and I slightly pushed my six-iron. I had a really good putt, I thought I had made it, but I didn't make it."
American Paula Creamer came third at the Siam Country Club after a six-under-par 66 in the fourth round, which took her total to 270.
Rachel Hetherington of Australia crept up the leaderboard on the last day by matching Davies' 65 to claim fourth, while former world number one Annika Sorenstam was sixth on 275.