Ashleigh Buhai won the Women's Open in dramatic fashion to earn her first major title after beating Chun In-gee in a play-off at Muirfield.

The South African held a five-shot lead going into the final round on Sunday, but needed four extra holes to seal the biggest victory of her career after a closing four-over 75.

Buhai held a healthy lead despite being one-over for her round at the turn, but a nightmare triple bogey seven at the 15th dropped to 10 under and into a share of the lead with Chun - who shot a one-under 70.

Both players avoided bogeys in their remaining holes to set up a play-off, and Buhai looked as if she was going to be victorious after a brilliant second shot got her onto the green, while Chun's second stroke landed in the bunker.

But a sublime chip from Chun put her on the green and she successfully putted for par, while Buhai's putt for birdie and the championship went awry.

The two matched each other again on the second play-off hole with bogeys, while another long championship putt for the South African on the third extra hole went agonisingly left.

A poor tee shot from Chun on a fourth attempt at the 18th hole meant it was advantage Buhai, and the 33-year-old held her nerve despite a poor second stroke to better Chun's bogey with a par and secure her first major title in stunning circumstances.

Seven.

Ashleigh Buhai cards a triple bogey on the 15th. She is now tied for the lead with In Gee Chun at -10.

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Hinako Shibuno, who led heading into day two, carded a level-par final round to finish third on nine under, while Madelene Sagstrom bogeyed the 18th to drop to joint-fourth alongside Leona Maguire and world number two Minjee Lee.

Another poor round from Olympic gold medallist and world number three Nelly Korda meant she finished tied for 41st at four over, while former world number one Lydia Ko finished joint-seventh at five under.