Matilda Castren became the first Finnish winner in LPGA Tour history on Sunday in the LPGA MEDIHEAL Championship, pulling away on the front-nine at foggy Lake Merced and holding off Min Lee by two strokes.

“Oh, my God. I can’t believe it’s happening,” Castren said. “I mean, I knew one day it would be me, but you didn’t think it was going to be so soon. But I’m obviously so happy right now.”

Two strokes behind Lee entering the final day of the tour’s two-week run on the San Francisco Peninsula, Castren birdied the first three holes, eagled the par-5 fifth and birdied the par-5 ninth for a front-nine 30.

Castren followed with eight straight pars and holed a 3-foot birdie putt on the par-5 18th for a 7-under 65. The 26-year-old former Florida State golfer won in her 15th career LPGA Tour start. She finished at 14-under 274 after tying for 30th last week in the U.S. Women’s Open at nearby Olympic Club.

Lee finished with a 69. She cut Castren’s lead to one with a birdie on the par-5 15th but dropped a stroke with a two-putt bogey on the par-3 17th.

“I think I’m playing good today,” Lee said. “Obviously, she played much better on the front, so I’m not going to punish myself because it was a great week.”

Lee missed a chance to became the first player to follow a Symetra Tour victory with an LPGA Tour win in her next start. The 26-year-old player from Taiwan won the Mission Inn Resort and Club Championship two weeks ago in Florida on the developmental tour.