Both pushed their second shots on the 18th into the bunker, but Jutanugarn made a near-perfect bunker shot to seal the win.
Another underdog story is brewing on day two of the U.S. Women's Open conducted by the USGA.
Ariya Jutanugarn holds the championship trophy after defeating Hyo-Joo Kim in a sudden death playoff in the U.S. Women's Open Championship golf tournament at Shoal Creek. Jutanugarn shot one-over 73.
The Kingdom's most successful golfer squandered a seven-shot lead with nine holes remaining before edging out South Korea's Kim Hyo-joo on the fourth playoff hole to become the first Thai to claim the richest prize in women's golf.
Vision54 coaches Pia Nilsson and Lynn Marriott were exhausted by the time they got off the Jutanugarn rollercoaster.
After a front nine 32 at Shoal Creek, Jutanugarn stood on the 10th tee with a seven shot lead, and it seemed the title was already a foregone conclusion.
Despite losing her big lead, Jutanugarn says she wasn't feeling nervous going to the two-hole playoff.
Seven shots in front, nine holes left. Karrie Webb and Katherine Kirk are on the cut-line of 4 over but have several holes to play tomorrow morning to move either way, amateur Robyn Choi is at 6 over and finished and appears to be missing the cut and Sarah Kemp also has holes to play but is at 10 over. Jutanugarn had some wiggle room.
"I hope to show up like it's another day", said Smith, whose husband, Duane, is her caddie.
"He's like, 'Come on. I was actually kind of happy with how I handled it a bit more today", said Smith, who is still seeking her first LPGA victory.
"I don't feel comfortable", said Oh, who has also never won a major championship.
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Mo adores her baby sister, even when she makes Mo clean up after her, but there was something special watching her sister clean up her own mess at Shoal Creek. Still, a subsequent capitulation threatened to portray the 22-year-old as the leading character in one of golf's most epic tales of woe. Her confidence shaken, she had another bogey on 12 and the tournament was suddenly much closer than anyone expected.
But Kim made another bogey at the 18th, and a fourth consecutive par was enough for Jutanugarn to add to her 2016 Women's British Open title.
Joaquin Niemann, the 19-year-old from Chile, birdied the 18th hole to tie for sixth.
Speaking after her win, Jutanugarn said: "I'm really honoured to join the list of players before me".
Sixty feet from the flagstick with a pond looming not far beyond, she blasted a courageous shot that trickled within a foot of the cup. Then Olesen hit his second shot into a green-side bunker after driving into the rough. "I don't know why".
"The clubs I had switched to after ANA, they were great, I felt good about them". "I am really excited. Pretty hard, but I still can see the shot".
Spain's Carlota Ciganda shot a three-under 69 to finish alone in third place, four strokes back of Kim and Ariya.
There were lots of smiles after the long, wet week concluded with a long, wacky day.
University of Alabama sophomore Kristen Gillman, who ended Thursday's first round in a tie for seventh after an opening 2-under round of 70, did not get to complete her second round due to inclement weather, far from it in fact.
World number 97 Smith, winless in 222 starts on the LPGA Tour, failed to notch a single birdie.