Under sunny Australian skies and with throngs of fans circling the green, France's Celine Boutier knocked in a two-putt par at No. 18 and earned her first LPGA Tour victory at the 2019 ISPS Handa Vic Open.
"It's massive. It's not something I expected".
David Law celebrates after holing an eagle putt at the last hole.
Overnight leader Ormsby still looked the likely victor until he made a mess of the par-3 17th hole, missing the green to the left and taking two chips before walking away with a double-bogey.
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.
Around the same time a huge roar reverberated around the Barwon Heads links and it was a Scot who had caused it. David Law, 27, is an unheralded player in this part of the world, having spent five years on the secondary Challenge Tour trying to find his way on to the main European Tour.
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Kemp opened her round with a double bogey but struck nine birdies to finish strong, unlike overnight leader Kim Kaufman, who blew a two-stroke lead with a disappointing six-over 78 and finished in a tie for eighth place.
Boutier carded a final round of level-par 72 to finish on eight-under 281, while Australian duo Kemp (65) and Oh (74) and England's Charlotte Thomas (69) tied for second on 283.
He won by one stroke from Australians Brad Kennedy and Wade Ormsby as Leona Maguire's former Duke University team-mate Celine Boutier clinched the LPGA Tour event by two shots on eight-under.
"We got hammered with the rain for about three or four holes there, so it was really good to get through that stretch", Asian Tour regular Stieger said after sinking seven birdies to stay in the hunt.
"We stood on the tee and we said we need to make eagle", Law said at the trophy presentation after claiming a A$1.5 million ($1.06 million) winner's cheque.
"Then standing on the 18th fairway, we knew that if you make an eagle, you put a bit of pressure on". "I'm just so emotional right now. I'm delighted. It's been an incredible event".
"I'm very happy with the way I handled myself".