She flew the green with her third shot at the par 5, leaving a long uphill recovery shot with water in play.
Thanks to her first LPGA major title at the US Women's Open, South Korean Park Sung-hyun soared to No. 5 in the latest women's world rankings announced Monday.
No American finished inside the top 10.
Shanshan Feng of China, a seven-time LPGA Tour victor who had led since the opening round, hung in with a chance, needing to hole out from the fairway with her third shot for an eagle at the 18th to tie Park.
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"Coming to this week, I didn't have any expectation at all", said Feng, who has lead from the start after shooting a 66 in her quest for a second major. "But I had the 1-under yesterday and I felt better about everything". Her 9-under 279 total was the lowest by an amateur in the history of the U.S. Women's Open.
The week was full of distractions on and off the golf course. They were protesting the USGA's decision not to move the championship from Trump National.
That created a steady hum of noise from people who hung around that area or stopped while passing through it. Fans and supporters, on the ground and on the balcony of the neighboring clubhouse, snapped iPhone photos and begged Trump to return their waves.
Inside the ropes, players battled puzzling greens and moody weather. Friday was soaked by driving rain.
"Well, I mean I think overall, before the last hole, I did pretty well", said Feng.
Teenager Hye-Jin Choi and perennial Open bridesmaid Amy Yang were tied for second in an event where the South Koreans have shined.
The victory catapulted her to a career-high No. 5 in the world, up six spots from a week ago.
She broke a three-way tie with a three-foot birdie putt after missing chances from 10 feet and twice from 12 feet in the closing holes. Langer led by one when he hit a tee shot in the water on No. 17, missed a 4-foot putt and ended up with double bogey. And with an impressive up-and-down for birdie from a hard lie in the rough on the par-5 15th, Choi remained atop the leader board.
England's Charley Hull mixed five birdies with three bogeys in a round of 70 that propelled her into a share of 14th on two under.
Choi found the resolve to birdie the last and would eventually finish alone in second position after her playing partner Feng, nearly inexplicably, triple bogeyed the last to drop to a share of 5th position. "Oh, [Park] must be winning".
The par meant that Feng needed an eagle on 18 to tie.
DeChambeau, 23, birdied four of the final six holes for a 6-under 65 and an 18-under 266 total.
"Rather than pushing myself for getting a birdie", she said through a translator, "I was just hoping to get through the hole, maybe with a par, and I was thinking maybe at the last hole that I might play a little aggressively". The president, wearing a Make America Great Again hat, enthusiastically clapped and gave Park a thumbs up as she walked by. Then she went out Sunday and did the exact same thing to actually win the tournament.