MOBILE, Ala. (AP) -- Jennifer Johnson won the Mobile Bay LPGA Classic on Sunday for her first tour title, birdieing four of the final six holes for a one-stroke victory over Jessica Korda and Pornagong Phatlum.

The 21-year-old American closed with her second straight 7-under 65 for a tournament-record 21-under 267 total on The Crossings course at the Robert Trent Jones Golf Trail's Magnolia Grove complex. She two-putted for par on the final hole, tipped her cap and headed toward the practice range in case of a playoff.

But Phatlum was already done and the lead was safe even with Korda's closing birdie. Phatlum, a 23-year-old from Thailand, closed with a 63. Her previous best finish was third at the Kia Classic.

Korda finished with a 68 that included three bogeys and seven birdies.

Five players finished two strokes back, including Hall of Famer Karrie Webb.