“I played really steady golf. It’s cool to be able to make those putts under pressure,” Henderson told Golf channel after sinking a three-foot par putt at the last to finish at 17-under 263.
American Lexi Thompson for the second consecutive week was unable to convert a 54-hole lead into victory. She carded 69 to tie for second with compatriot Michelle Wie (65) at 15-under.
Eight players were tied for the lead at one stage of the final round but Henderson broke clear with three birdies in five holes around the turn.
“I was surprised when I looked at the leaderboard and had a two-shot lead on the 18th green but I’m super happy,” Henderson said.
She is the 15th different winner on the LPGA Tour in 15 tournaments this season, the longest streak without a repeat champion since 1991.
Henderson, now 19, burst onto the LPGA scene by winning the Portland Classic by eight strokes in 2015, becoming the third player to triumph before turning 18 after Thompson and Lydia Ko.
She added two more victories last year, including the Women’s PGA Championship major.
Sunday also marked the continued improvement of former child prodigy Wie, whose runner-up finish came after a tie for third in her previous start.
Wie, 27, has four career victories, including the 2014 U.S. Women’s Open.
(Reporting by Andrew Both in Cary, North Carolina; Editing by Ken Ferris)
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