The South Korean seized control with a 15-foot birdie at the penultimate hole, where she perfectly read a sharply-breaking putt at the Evian Resort in Evian-les-Bains on Sunday.

She parred the last, before letting out a big smile, raising her arms in celebration and hurling her ball into the gallery.

Ko finished at 15-under 269, less than four months after claiming her maiden major title at the ANA Inspiration in the California desert.

There are five official majors in women's golf.

Ko came from four strokes behind the overnight leader, fellow Korean Hyo Joo Kim, whose hopes disappeared with a triple-bogey at the par-3 14th, where her ball plugged in a greenside bunker.

"Last night I thought if I play a really good (final round) I can win," Ko said before being presented with the trophy by American skier Lindsey Vonn.

Kim (73), China's Shanshan Feng (68) and American Jennifer Kupcho (66) tied for second on 13-under.

RIGHT: Shanshan Feng shared second place with Kim and Kupcho. PHOTO: Stuart Franklin/Getty Images.

With her fifth LPGA Tour victory in less than two years, Ko, 24, is projected to reclaim her World No.1 ranking.

There is no secret to Ko's success other than a flawless swing and a consistency others can only dream of.

Apart from her three LPGA wins this year, Ko has also finished runner-up three times, and has never been outside the top 30.

Top-ranked Sung Hyun Park (75) was let down by her putting in falling to a tie for sixth at 10-under.

The best Australians were PGA champion Hannah Green and Katherine Kirk, who both finished one-under in equal 30th.

Fellow Australian Su Oh finished one-over, while Sarah Kemp ended up seven-over.

Sunday's round was delayed by heavy rain, and the final group did not finish until after 7.30pm local time.

The final group crawled around the back nine in two hours and 47 minutes, but at least they finished, saving the tournament from spilling into Monday.

The Evian was the first of back-to-back majors, ahead of the Women's British Open that will start at Woburn on Thursday.