Mirim Lee won a three-way play-off against Nelly Korda and Brooke Henderson to clinch Ana Inspiration title, while Ireland's Leona Maguire claimed a top 20 finish.
Lee chipped-in twice in the last three holes to force her way into the play-off against two much more fancied players and then birdied the first sudden-death hole to take the first women's major of the year.
Maguire finished tied for 18th place after a fine round of 69 saw her finish on -6 for the tournament.
Maguire had her first bogey free round of the tournament and hit three birdies to help propel her up the leaderboard and claim just under $40,000 in winnings.
Stephanie Meadow had a less enjoyable day and her round of 76 was her worst of the tournament as she hit five bogeys to finish on +2 for a share of 51st place.
Amateur Olivia Mehaffey also shot a 76 and she finished on +13.