World number eight Lexi Thompson fired a final round of 69 to win the individual title at the Aramco Team Series in New York by three shots while Cavan's Leona Maguire finished in a tie for 18th.
Major winner Thompson began the day with a one-shot lead over compatriot Nelly Korda and started brightly with a birdie on the first.
Thompson then dropped a shot at the third but bounced back with a birdie on the next hole before making another bogey on the ninth.
However, back-to-back birdies on 10 and 11 put the Solheim Cup star in control once again before birdies on 15 and 17, and even a bogey on the last couldn't spoil the party as she clinched a three-shot victory.
"I've been working extremely hard on my game," she said. "I felt like it was a matter of time, but I just wanted to play golf and put myself in contention in the final rounds and learn from the losses that I had and what I needed to work on, and I brought that into today.
Maguire also saw a final-round 69 to end on one-under-par overall, 10 shots off Thompson.
