A final round of 70 at the ISPS Handa Vic Open left Leona Maguire an agonising one shot behind the three-way leaders, as the Cavan golfer missed out on an LPGA play-off by the narrowest of margins.
Her two-way tie for fourth place on seven under was her best result yet on the Tour and earned Maguire $52,861 (€48,294).
A final round 76 saw Stephanie Meadow finish in a tie for 20th on two under.
Maguire will rue three dropped shots among five birdies as she finished a shot behind South Korean trio of Hye-Jin Choi, Hee Young Park, and So Yeon Ryu.
Hee Young Park won the play-off to claim the $165,000 first prize.
Former winner Min Jee Lee finished a further shot behind Maguire, but there was still something to celebrate in their household as Min Woo Lee emulated his sister Minjee in the men's event to claim his maiden European Tour title with a two-shot victory over Ryan Fox.
Lee went into the final round with a three-shot lead and the 21-year-old showed no signs of nerve as he carded a four-under-par 68 to finish with a winning aggregate of 19-under 269.
"I started off really hot off the gate and it was pretty comfortable those last few holes," Lee, who began with a birdie on the first, said afterwards.
He bogeyed the 17th to take a single shot lead down the last and birdied the par-five as sister and two-time champion of the women's event Minjee looked on.
"It was nice of her to come on...my sister and I winning the same tournament, it's pretty special. I've got bragging rights now, so it's even better," he said.
New Zealander Fox carded a closing 64 in the high winds to put pressure on Lee down the stretch but could not deny the Australian his breakthrough victory.
Marcus Fraser and fellow Australian Travis Smyth joined Frenchman Robin Sciot-Siegrist at 14 under, two shots clear of another Australian in Jake McLeod.
Minjee, who won the women's title in 2014 and 2018, could not make Sunday's playoff and finished two shots behind the leading Korean trio of Hye-Jin Choi, Hee Young Park, and So Yeon Ryu who were locked at 281.