Stacy Lewis donated her £150,000 winnings to the flood victims in Houston after holding off the challenge of Chun In-gee to claim victory at the Cambia Portland Classic.
Lewis pledged before the tournament that she would give her prize money to those affected by Hurricane Harvey in Houston, where she and her husband - University of Houston women's golf coach Gerrod Chadwell - have a house in the north east of the city.
The 32-year-old American looked well on course to be able to hand over the USD 195,000 (£150,000) first prize when she started the day with a three-shot lead over the chasing pack and then birdied the opening two holes.
Lewis dropped a shot on the fourth but picked up further birdies on the sixth and seventh to reach the turn in 33. However, while she finished her round with 11 successive pars to card a 69 and finish on 20 under for the tournament, Chun made her sweat for the victory.
The South Korean recorded six birdies in a blemish-free 66 but ended up finishing one shot behind Lewis on 19 under after pars on 17 and 18.
Lewis, who did well to avoid dropping shots on both the final two holes, admitted the final day was "much harder" than she had anticipated before clinching her first LPGA Tour title since 2014.
She said on www.lpga.com: "In-gee just played great and I knew she would and I knew it was going to be hard.
"I was hitting a lot of good shots, hitting a lot of good putts, and they just weren't going in. To make that up-and-down on 17 and then to hit that shot out of the bunker on 18, it's something you dream about."
Having been told her sponsor KPMG would match her donation to the relief effort in Houston, Lewis said: "That's unbelievable. When I said that I had the goal of winning the tournament and you've got to get a lot of things right to go your way.
"What we're going to be able to do, we're going to be able to help people rebuild houses and get their homes back. That's more important than any win."
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