Australia's never-say-die golf aces have completed an epic week of improbable comeback wins with a stylish victory over the top-ranked USA in the final of LPGA Tour's biennial showpiece teams event in South Korea.

Led by the magnificent Minjee Lee and steely Steph Kyriacou, who both finished unbeaten in five thrilling match-play encounters, Australia captured the unofficial "World Cup" of women's golf after a day of high drama in Seoul on Sunday.

Fittingly, world No.3 Lee put Australia 1-0 in front with a 2 & 1 triumph over Angel Yin in the opening singles match of the final before fellow heavyweight and Perth stablemate Hannah Green clinched the tie with another 2 & 1 victory over Yealimi Noh.

"I finished first and then I saw Hannah's final hole, and then obviously we were done after that. It was really lovely," Lee said.

"I'm so happy that I could do it with these girls. It was just a lot of fun this whole week.

"Playing match play is something different, and we don't really get to do it too often."

With 11 birdies in 16 holes in a phenomenal semi-final display earlier on Sunday, Noh - and the previously undefeated Yin too - had been colossal for Team USA all week.

But the pair could not match Lee and Green, who stood up when it mattered most.

While all four Australians contributed, Lee was a class above once more in a stellar season that has already yielded her a third career major and which could yet climax with world player-of-the-year honours next month.

The 29-year-old accrued 4.5 out of a possible 5 points for the week, going unbeaten in three four-ball matches with Kyriacou, then winning both her singles encounters in Sunday's semis and final.

Lee's stunning 1-up victory over Canadian Brook Henderson, from three down with six holes to play, in the semi-finals against Team World, was a win for the ages - and her fourth stirring comeback win of the week.    

Kyriacou was immense too, draining a tension-filled nine-foot downhill sliding putt for birdie on the 18th hole on Saturday to thrust Australia into the semis during her own unbeaten campaign in four-balls and foursomes.

Kyriacou and Kim were 1 up against Americans Lauren Coughlin and former world No.1 Lilia Vu when they watched Green hole the trophy-winning putt from the 17th fairway, prompting spontaneous and unbridled celebrations from the Australian team and entourage. 

"It takes a lot of grit to win," Kyriacou said.

"In a lot of our matches we were behind the eight ball, especially going into the back nine. I don't think we were up in a match. Well, me and Minjee definitely weren't.

"We managed to come back in every match. With me and 'Gracey', I think having grit throughout the week got us over the line."

After a lean encore to her three-title season last year, Green had not won a point in five days before burying Australia's winning birdie putt in the final.

Australia would not have prevailed without Kim either.

The young major champion holed a similarly pressure-filled 10-foot birdie putt on Sunday morning to push her and Kyriacou's foursomes match into the sudden-death semi-final play-off that Australia ultimately won on the 20th hole.

"I was inspired by Steph's putt yesterday," Kim said.

"I had a left-to-right as well. Obviously 18 is a tricky green. Steph said, 'We're going to go extra holes'.

"I said, 'OK. So we holed the putt and went to the 20th."

After falling victim to Australia's comeback queens in the semis, having enjoyed multi-hole leads in all three matches on the back nine, Lydia Ko's Team World beat second seeds Japan 2-1 in the third-place play-off.

Englishwoman Charley Hull outclassed Ayaka Furue 4 & 3 in the first singles match before New Zealand's Hall-of-Famer Ko sealed the victory with a 3 & 2 win over Rio Takeda.

Mayo Saigo and Miyu Yamashita, two other 2025 major winners alongside Lee, Kim and Sweden's Maja Stark, gained a consolation point for Japan with a 4 & 3 victory over Henderson and Taiwan's Wei-Ling Hsu.