Thitikul carded a three-under 69 on the final day at Liberty National to end the week on 17 under, with three birdies in a bogey-free final round pulling her clear of closest challenger Celine Boutier.
Andrea Lee shared third spot with Spain’s Carlota Ciganda, while Korda – the defending champion – was in contention but slipped back into tied-fifth alongside Yealimi Noh and Stephanie Kyriacou after a one-over 73.
Thitikul’s win is her first of the year on the LPGA Tour and follows success on the Ladies European Tour earlier this season at the PIF Saudi Ladies International, with her latest victory lifting her top of the Race to CME Globe standings.
“I know that a lot of putts didn’t drop on the front nine, but I’m trying to do my best,” Thitikul said. “I was just trying to tell myself, ‘be patient, it’s coming, it’s coming.’ That’s pretty much what I told myself today.”
Korda, looking for her first win of 2025, was within a shot of Thitikul until she found the hazard off the ninth tee on her way to a bogey. The world No 1 then failed to find another birdie on her back nine, dropping two shots over her final four holes.
Boutier threatened the lead until she carded a three-putt bogey from 10 feet at the 15th, where Thitikul produced a brilliant up and down from the sand to save par, dropping the Frenchwoman three off the lead.