PHOENIX -- Sei Young Kim turned an anticipated Sunday shootout into a record-tying blowout.
The 23-year-old South Korean player matched Annika Sorenstam's LPGA Tour scoring record of 27 under by closing with a 10-under 62 at Desert Ridge for a 5-stroke victory in the JTBC Founders Cup.
"I didn't think about that," Kim said when asked about Sorenstam's record. "But I thought, 'If I win, I have to score low.' ... It's a dream come true. I scored 10 under. It's my best score ever -- ever."
Sorenstam set the mark in 2001 at nearby Moon Valley, where she shot a record 59 in the second round.
"Before I begin this tournament, I read a book about Annika Sorenstam," Kim said. "I got a lot of inspiration from that story. ... She's still my idol. When I was young, I watch her play on TV."
Kim matched the tournament record of 62 set Thursday by Mi Hyang Lee. She missed a chance to break the records when her 18-foot birdie try on the par-4 18th slid left.
"Congratulations to Sei Young on her outstanding play this week," Sorenstam said from Tahoe, Nevada. "I thought she was going to make that last putt. It's hard to believe it's only her second year on the LPGA."
Kim opened a 6-stroke lead with an eagle on the par-5 11th and easily held off top-ranked Lydia Ko.
"She just was real calm and just played within herself all day," caddie Paul Fusco said.
Kim opened the season with a second-place tie in her Bahamas title defense and followed that with a third-place tie in Florida. Then she tied for 48th in Thailand and tied for 34th in Singapore.
"I had a couple of tournaments, very struggle with myself," Kim said. "After the last putt, I think about a lot of people, my family. ... I feel like almost crying."
Kim won last season in Hawaii and China and was the LPGA Tour rookie of the year. She will jump from seventh to fifth in the world ranking, which puts her in the second position for South Korea's four-woman Olympic team.
After two late bogeys Saturday left her a stroke behind third-round leader Eun-Hee Ji, Kim played the first 11 holes in 7 under on another hot day at Wildfire Golf Club. She reduced the drama to the scoring-record chase with the eagle on No. 11, where she hit a 5-wood from 241 yards to 3 feet.
"I just focus on the pin and just hit it," Kim said. "I was, like, surprised how close it was."
She birdied the par-4 13th, par-5 15th and par-4 16th -- hitting to 2 feet -- and saved par with a 7-footer on the par-3 17th.
Ko made four straight birdies on the back nine in a 65.
"I started the week pretty slowly with the 2-under par, and you feel like around this course, 4 under is like even par," Ko said. "But it's been a good last three days."
Jacqui Concolino, playing alongside Kim, was third at 20 under after a 68.
"I was kind of zoned out," Concolino said. "I didn't really realize how low she was going, but she put on a phenomenal performance."
Stacy Lewis had a disappointing finish to stretch her victory drought to 44 events. Tied for second with Kim entering the round, the Texan three-putted from 5 feet for a double-bogey on the par-3 fourth and shot a 70 to tie for fourth at 19 under. She won the event in 2013 and finished second the past two years.
"You knew somebody was going to do it," Lewis said. "Just the way this golf course was playing this week, you kind of had to figure somebody was going to go out there and shoot a low score."
Lewis switched putters after an opening 70 and went to a prototype model called the Happy Putter. It lived up to the name the next two days, with rounds of 65 and 64, but produced few smiles Sunday.
"Not very good," Lewis said. "Just got off to a bad start, and putts just didn't go in like they had the last couple of days."
Ji (71) finished at 19 under along with 18-year-old Canadian Brooke Henderson (67), Megan Khang (66) and Paula Creamer (68).
"I looked up at the scoreboard a couple of times this week, and I was like, 'Wow, that's really good shooting,'" Henderson said. "You just got to focus on your own game."
U.S. Women's Amateur champion Hannah O'Sullivan tied for 33rd at 13 under after a 67. The 17-year-old amateur is a high school senior in the Phoenix suburb of Chandler.