The South Korean pulled away from fellow overnight co-leader Nicole Broch Larsen with six birdies on the back nine to finish the tournament at 26-under 262.

Dane Broch Larsen carded a 69 to finish solo second at 21 under.

Defending champion Brooke Henderson of Canada (69) finished seven shots off the winner in a tie for third place at 19 under with American Lizette Salas (64).

FINAL LEADERBOARD

World No.4 Minjee Lee and Katherine Kirk both carded final rounds of 69 to join Su Oh at 10 under as the leading Australians in a share of 25th.

Sarah Kemp struggled to a 74 on Sunday to slip back to one under for the week.

Ko and Broch Larsen, who is from Denmark, entered the final round tied for the lead.

The round was broken up into trios, with groups teeing off at the 1st and 10th tees to ensure it didn't run up against the PGA Tour’s Playoffs finale.

Ko cemented her fourth LPGA win of 2019 with birdies on four of her last five holes. She earned US$337,500 of the US$2.25 million purse with the win.