Hannah Green has clinched a stunning victory in the Women's PGA Championship, becoming the third Australian woman to win a golfing major title after Karrie Webb and Jan Stephenson.

Key points: Hannah Green grew up playing golf at the Mt Lawley club near Perth — now the 22-year-old has won the Women's PGA

Hannah Green grew up playing golf at the Mt Lawley club near Perth — now the 22-year-old has won the Women's PGA Karrie Webb (seven wins) was Australia's last previous winner of a women's major title in 2006

Karrie Webb (seven wins) was Australia's last previous winner of a women's major title in 2006 Jan Stephenson is the other Australian woman to win a golf major, winning three titles in the 1980s

The 22-year-old Perth native won by a single shot over South Korean golfer Sung Hyun Park.

Green hit an iron shot approach into the bunker on the par-four 18th, but she left herself a nervy five-foot putt to win the title, and she holed out to seal her first major win.

"When I was over the putter I was really nervous," Green told the ABC.

"I really did not want to miss the putt to then force the play-off.

"For me, I really just wanted to end on a positive note. So for me to hole that putt was huge."

Hannah Green had never won an LPGA event before this week— now the Australian is the Women's PGA champion. ( AP: Charlie Neibergall )

Green is a second-year player on the LPGA Tour after finishing fifth in the Rookie of the Year standings in 2018.

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She was ranked 114th in the world before this week, where she took the lead in the opening round and held it for the rest of the tournament.

Leading by one shot from Thailand's Ariya Jutanugarn going into the final round, Green got to 10-under for the tournament with a birdie on the second hole.

She moved to 11-under with another birdie at the par-five seventh, as Jutanugarn struggled.

The Australian was leading by four shots at that point, but then nerves began to appear.

Green bogeyed the ninth, where she took three putts from 45 feet away.

She then missed a putt to get the lost shot back on the 10th, before bogeying the 12th and 13th to bring her back to the pack.

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However from there Green — who had holed out from 40 yards for a par and splashed out of a bunker for a birdie earlier in the tournament — used her scrambling skills to maintain her one-shot hold on the lead.

She birdied the 16th to extend to two shots, but the defending champion Park kept the pressure up with a birdie on the last.

"I didn't really have any experience to come off being in that position. It was really nervous coming down the last four holes," Green said.

"I just wanted to make sure I kept in there and make pars and birdies at best. I was really emotional when I won."

Green is a former Karrie Webb scholarship winner, and Webb — who has won seven major golf titles — was there to watch her this week in Minnesota.

"It's amazing, I've always wanted to win in front of an Aussie crowd but even though I'm not in Australia [right now] that's what it felt like today," Green said at the presentation ceremony.

"To be winning a major as my first event [victory], I'm just over the moon."