Ko held at least a share of the lead after every round at Boca Rio Golf Club en route to securing her 17th LPGA Tour victory. Ko's final-round, three-under-par 69 polished off a 14-under 274, one better than Kang, who was at her heels throughout the week.

"There haven't been many times where we've played (together) in the final group," Ko said.

"I know she's been playing such amazing golf going into today, so I just tried to focus on me and tried to play the best golf I can. I know at points it was a bit of a grind, but I'm glad that I could get that done."

Ko, 24, entered Sunday's round with a two-shot advantage over Kang. But Kang took the solo lead with birdies at the 11th and 12th before giving it back with a costly bogey at the par-3 13th. Kang fired a four-under 68 to earn second place.

Japan's Yuka Saso tied the low round of the day with a 67 that helped her place third at 12-under. England's Charley Hull (68) and France's Celine Boutier (69) tied for fourth at 11-under.

Su Oh was the best of the Australians in a tie for 27th at one-under after a final round two-under-par 70 while Karrie Webb (74) finished four-over.

Kang kick-started her round with birdies at the first and third holes while Ko played the front nine in even par, tying the playing partners at 11-under. They both birdied the par-4 11th before Kang drained a lengthy birdie putt at No.12 for the outright lead.

But a missed par putt on the next hole meant that Kang's advantage was short-lived. Ko saved par there before making the go-ahead birdie putt at No.15.

She also escaped danger at the par-3 17th hole, saving par when she hit out of the greenside bunker to mere inches from the cup.

Kang, 29, was vying to win her second event in as many weeks. She was victorious at last week's Tournament of Champions to kick off the 2022 Tour schedule.