Grant, 24, shot a three-under 68 in the final round to post the winning score of 21-under at Highland Meadows Golf Club on Sunday, three shots ahead of runner-up Allisen Corpuz.
Australia’s Steph Kyriacou, who had gone into the final day tied for second, shot a two-under 69 to finish tied for fourth at 14-under, her best finish on the LPGA Tour.
“I learned a whole lot about the mental side of golf,” Kyriacou said.
“How to deal with nerves and all that stuff. (I have) a lot of things to take away from this week, even though one wasn’t a trophy.”
Sweden’s Grant entered the day with a six-stroke lead after firing a 62 in the third round.
She has won five times on the Ladies European Tour but had yet to taste success stateside.
“I’ve been thinking about it all day,” Grant said.
Kyriacou recorded her best finish on the LPGA Tour with her fourth…