The 29-year-old South Korean player birdied the par-5 16th and par-4 17th and parred the par-4 18th to finish at 21-under 267 at Blythefield Country Club.

“I've been working really hard with my coach and my psychologist, trainer, my whole team, and then finally I was able to find the last piece to everything putting together, so it's really, really meaningful to me,” Ryu said.

Two strokes behind Anna Nordqvist and Lee-Anne Pace entering the round, Ryu had six birdies and bogey in the final round.

Caroline Masson finished second after a 68. New Zealand's Lydia Ko shot a 67 to finish third at 18 under.

Victoria's Su Oh closed with a final-round 67 to be the best-placed Australian, finishing in a tie for 13th.

Nordqvist and Pace each shot 73 on Sunday – after both had a 64 on Saturday – to tie for fourth at 17 under with Jacqui Concolino (66), Azahara Munoz (68) and Angela Stanford (70).

US Women's Open winner Ariya Jutanugarn shot a tournament-record 62. She birdied five of the first seven holes, eagled No.8 and added three more birdies to finish 12th at 15 under.