Brooke Henderson won her second major title after six years of waiting.
The Canadian won the Evian Championship by one stroke on Sunday after making an 8-foot putt at the 18th hole.
Henderson was soaked in champagne by fellow players on the 18th green after an even-par round of 71 that saw her finish 17-under 267 and ahead of Sophia Schubert, who was one of many to make a run at Henderson.
Five players were tied for third, including Mao Saigo and Lydia Ko.
Henderson started the final round with a 2-shot lead over Ryu. After the first hole, it was wiped out due to a bogey from Henderson.
The final round of the fourth major of the year began with four-putts from Henderson and Ryu, a spectator picking up a ball that dribbled into the rough and landed by her feet, and a seven-way tie for the lead.
In total, there were 13 lead changes, with Henderson only knocked out of it by a par at the 12th.
Henderson kept pace with the other with two pars at the 14th and 15th. After reaching the 18th, the pair were tied for the lead and Henderson was in front.
After Henderson had a wild hook off the tee, Schubert's putt came to rest barely an inch from the cup, only for the ball to go off the trees and back out to the rough.
She sent her third shot to 8 feet after laying down. Henderson bent her knees as the ball fell into the cup, after she missed the first try.
She was a big winner again.