It was a small miracle that Park even found her way into the playoff.
"I think those four birdies in the front nine today helped with the confidence", she said. That prevented her shot from going in the water and she ended up with a par on the hole. She holed out from a greenside bunker at the seventh and knocked a 3-hybrid to 15 feet at the 11 hole.
The remaining pair headed next to No. 16, also a par 4, where-after a brief rain delay-Park drained a 9-foot birdie putt to claim the title.
She had a 2-shot lead in regulation when she put her tee shot into the water on No. 17, but So Yeon Ryu's missed birdie putt on the second playoff hole sealed her fate.
Ryu was the overnight leader at 11-under but committed two double bogeys for a 73 in the final round, while blowing a two-shot lead with two holes to play to fall into the playoff.
Ryu, Park and Hataoka went back to the 18th for the first playoff hole.
After Park and Ryu birdied the first extra hole to eliminate Hataoka, Park clinched victory at the next with another birdie at Kemper Lakes in Kildeer, Illinois.
Park had a historic rookie year in 2017. With this major title, Park's early season woes - which saw her miss two cuts in seven starts with one top-10, after not missing any in 23 events past year - are well behind her.
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It was tight at the top of the leaderboard for each of the opening two days at Kemper Lakes, but Ryu produced a flourish on the final holes of her third round to create a three shot advantage.
But Park secured her second major in less than a year with birdies on each of the two play-off holes. She fired a first round in the 60s in 10 of her 12 starts.
Historic Baltusrol Golf Club in Springfield, New Jersey was named Saturday as host of the 2029 PGA Championship, its 10th major men's tournament, and the 2023 Women's PGA Championship. While she most likely was going to make the team, there was doubt because Hye Jin Choi was one spot behind her in the world rankings and In Kyung Kim was just two spots behind. Ryu and Henderson were paired together and shared the 36-hole lead with Sung Hyun Park.
But the malaise continued when Ko bogeyed the 7th and 8th to turn two over for her round and one under for the tournament.
Americans Angel Yin (71) and Jessica Korda (69), on seven under finished tied fourth. "I was really happy". She won the NW Arkansas Championship last week for her first tour title. The latest win is Park's second victory of this season since she won the Volunteers of America LPGA Texas Classic in May.
If she wants to wins more majors she'll need to figure out her play on the greens, and that may need to go beyond an equipment change.
The 24-year-old said she drew upon her experience of winning last year's U.S. Women's Open and added, "Late in the round today, I kept thinking about what I did to win the U.S. Women's Open last year". Hull has been consistent outside the majors too.