It was a day of firsts in the final round of the Vic Open at 13th Beach Golf Links on the Bellarine Peninsula near Melbourne with the men's victor, David Law, and the victor of the women's event, Celine Boutier, both winning for the first time on their respective tours.
The Women's Australian Open, also sanctioned by the LPGA, will be played next week at The Grange in Adelaide.
Australia's Wade Ormsby was on track to claim the men's title coming down the back nine before Law eagled the 18th to draw himself level.
Oh arrived in the final group despite a 74 that threatened to be much worse after a pair of opening bogeys, but wore down former Women's Australian Open champion Haru Nomura (76) who was a victim of the trying weather as the day progressed, but clung on at seven under.More news: Bitcoin Pops Above $3,700 As Crypto Market Flashes Green
Law birdied the 16th and sank an eight-foot putt on the par-five last to card a six-under 66 and win on 18 under.
Scotsman David Law, South African Justin Harding and Australia's Brad Kennedy were then three shots off the lead in a tie for third place.
Playing in the second last men's group at 13th Beach, Law knew he needed to eagle the par-5 final hole to get into contention.
"I hit a great shot in and it was a nice putt, eight feet down the hill and pretty straight". "I'm delighted. It's been an awesome event".More news: Adesanya earns hard-fought UD win over hero Silva at UFC 234
Law, who is in his rookie year on the European Tour after several years on the Challenge Tour, produced the round of the day (66) to win the first prize of $A$250,000 (equivalent), the round even including a one-shot penalty at the 9th after moving his ball.
"I've been dreaming of this win since I first started playing golf", she said. I just kept grinding, really, that's all we can do in weather like that. "It's been something I've been working towards since I turned pro and I just feel like it just happened -- I don't think I realise right now".
"You're going to hit a lot of bad shots, need to recover a lot and I did that quite well so I'm happy".
France's Celine Boutier won the women's event by two shots from three players including England's Charlotte Thomas. Her nine birdies led to a 7-under 65, her best round since the fourth round of the 2010 Jamie Farr Owens Corning Classic, and skyrocketed her up the leaderboard to a tie for second.More news: Grammys the latest casualty of this tumultuous award season
Second-round leader Kim Kaufman holed out from the bunker for birdie on the par-3 seventh hole which helped her take a two-stroke lead into the final round of the LPGA's Vic Open.