It’s the first major and sixth career LPGA Tour victory for the 24-year-old South Korean star, who came into the tournament ranked fifth in the world.
Choi came into Sunday with a six-stroke lead after shooting a 7-under 65 on Saturday.
She got into trouble Sunday when she triple-bogeyed No. 10, but recovered to win at the same course where Se Ri Pak won South Korea’s first major title in 1998.
Pak was among a group of friends who met Choi after she putted out on the 18th green, showering her with hugs - and victory champagne.
Choi could afford to have one bad hole Sunday thanks in large part to her remarkable performance Saturday when she had matched the fifth-lowest single round in Open history.
Michelle Wie finished the tournament 10 over. After shooting a 66 on Friday to close with a stroke of the lead, she had weekend rounds of 78 and 80.
Top-ranked Yani Tseng finished 14 over, and still needs an Open victory to complete a career Grand Slam.
Rookie Potter sinks birdie to win Greenbrier playoffView Entire Story
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