LANCASTER, Pa. -- Yuka Saso became a U.S. Women's Open champion for the second time Sunday and took her place in history with a rare footnote -- the first Filipina to win the Women's Open in 2021, and now the first from Japan to win women's golf's biggest event.

No matter the flag, the 22-year-old Saso delivered a masterful performance at Lancaster Country Club with a 2-under 68. She ran off four birdies in a five-hole stretch on the back nine amid a series of collapses and won without much drama.

Saso got up-and-down for par from short of the 18th green to finish at 4-under 276, winning by three shots over Hinako Shibuno, who in 2019 became the first Japanese player to capture the Women's British Open.

At 22 years, 347 days, Saso became the youngest two-time champion in U.S. Women's Open history.

Saso and Shibuno were the only two players under par, the fewest for the Women's Open in 10 years. Saso's only other LPGA Tour victory was the Women's Open at Olympic Club in 2021. She also has two titles on the Japan LPGA.

Andrea Lee, part of a three-way tie for the lead at the start of this wild day, was the last player who had a chance to catch Saso. But the Stanford alum, a former No. 1 amateur, badly missed her tee shot on the easy 16th and had to settle for par, then took bogey on the 17th. Lee took one last bogey on the 18th for a 75 to tie for third with Ally Ewing (66).

Saso has said she wishes she could play for two flags -- her mother is from the Philippines, her father from Japan. She decided to switch citizenship before turning 21, and Saso wound up leading a strong showing by Japan -- five players were among the top 10.

Saso won $2.4 million from the $12 million purse, the largest in women's golf and in women's sports at a standalone venue.

The victory also put Saso in position to return to the Olympics -- she played for the Philippines in 2021 in the Tokyo Games.

As much as Saso shined, Sunday was filled with meltdowns. The final two groups combined to go 22-over par, none more shocking than Minjee Lee.

The two-time major champion who captured the Women's Open at Pine Needles two years ago led by three shots on the front nine. She still had control until putting her tee shot into the water on the par-3 12th and took double bogey to fall into a tie with Saso.

She hit into waist-high grass two holes later for another double bogey and closed with a 78.

Wichanee Meechai of Thailand, the outsider among the leaders with no LPGA wins and a No. 158 world ranking, fell out early and took a triple bogey on the par-3 sixth. She shot 77.

Saso wasn't immune from mistakes. She had a four-putt double bogey on the par-3 sixth that left her four shots behind Minjee Lee. That was the last of the mistakes that mattered.

Her big run began with a 10-foot birdie putt on the 12th, followed by a wedge to 3 feet on the par-5 13th hole. She hit her approach to 6 feet on the 15th hole and then delivered the winner, a 3-wood to 20 feet on the reachable par-4 16th for a two-putt birdie.

She three-putted the par-3 17th, but she had room for error. Saso was in the scoring room when it became official, and every player came through to share a hug.

Saso is the second woman to win a major under two flags. Sally Little won the 1980 LPGA Championship for South Africa, and then won the du Maurier Classic in 1988 as an American citizen.

Saso is the third player representing Japan to win a major, joining Shibuno at the 2019 British and Chako Higuchi at the 1977 LPGA Championship.

Information from The Associated Press was used in this report.