TURNBERRY, Scotland (Ticker) -- Jennifer Rosales surprised herself with a personal-best 7-under-par 65 on Saturday to grab a share of the lead with Sweden's Carin Koch after the third round of the British Open.

Born in the Philippines, Rosales had seven birdies in a bogey-free round to tie the women's course record at Turnberry. She is 12-under 204 overall in the last major of the season.

"I am really surprised," said Rosales, who had a career-best finish of third last year at The Office Depot. "I really felt good this week hitting my drives in the fairways. I did what I could today. I made my putts."

The 23-year-old Rosales was a five-time champion of the Philippine Ladies Amateur Open from 1994-98 and won the NCAA individual title as a freshman at USC in 1998.

Koch continued her consistent run with a third straight round of 68. She missed a four-foot par putt at the 17th hole but closed with a 30-foot birdie on 18.

"Obviously, I was disappointed with 17," Koch said. "I was 60 yards from the green and pitched it up short and then 3-putted. That's just not allowed in golf, but the putt on 18 definitely made up for a little bit of that."

Koch won Playboy.com's "Babes of the LPGA" poll as the player fans most wanted to see in a nude pictorial, collecting 6,854 votes -- nearly a quarter of those cast -- earlier this year. Her tour nickname is "The Face" for her appearance.

"I think it's fun," said Koch, a 31-year-old blonde. "It's been more attention than I was used to before."

Koch is looking to gain attention for her ability on the course as well. In eight years on the LPGA Tour, she has won just once, claiming last year's Corning Classic.

"To be in the last group on any occasion, but especially a major in Europe, I mean, I can't think of a better position to be in," she said.

American Natalie Gulbis fired a 67 on Saturday and shares third place with Paula Marti of Spain at 10-under 134.

The 19-year-old Gulbis had five birdies in a bogey-free round, including a dramatic chip-in from 25 yards on the final hole.

"I didn't really have anything to lose here," said Gulbis, who has earned four top-10 finishes in her rookie year. "I was so excited to come over, I've never been over here and I've just been trying to have fun and I've had a great week."

The 22-year-old Marti had five birdies and two bogeys.

Karrie Webb of Australia carded a 70 on Saturday and is tied with fellow Australian Michelle Ellis and Americans Tina Barrett and Beth Bauer at 9-under.

Webb is trying to become the first player since 1964 to win a major in four straight years and has 11 come-from-behind wins in her career, all from two strokes or more.

"Obviously, I'd like to be leading, but three shots isn't too far behind on this golf course," Webb said. "If we could get a bit of wind tomorrow, it definitely could go any way."

Koch believes Webb is the biggest threat.

"Karrie is just such a consistent player," Koch said. "She's won majors before, which a lot of us haven't. And that's very much an advantage for her."

Webb opened with a bogey on Saturday, but rebounded to make birdies at Nos. 3 and 6. On the back nine, she had one birdie and eight pars.

Taiwan's Candie Kung, who set the course record with a 65 on Thursday, shot a 71 and is also three strokes behind the co-leaders.

Defending champ Se Ri Pak of Korea carded a 69 and is among six golfers at 8-under 136.

Korean Mi Hyun Kim, who won her last two LPGA tournaments and was the runner-up here last year, struggled with a severe cramp in her foot, finished with a 75 and is 3-over.

"My right foot is bad and got worse each day," Kim said.

Annika Sorenstam, the top female player in the world who won six of her first 14 starts this season, missed the cut Friday for the first time in 75 events.

Rosales had an error-free front nine of 32, with birdies at the third, sixth, seventh and ninth before adding another at the tough par-3 11th from eight feet. At the 16th, Rosales rolled in a nine-footer and equaled Kung's course record with a six-foot putt at the 17th.

"I think the key for me tomorrow is to make sure I stay aggressive," Rosales said. "That's the only way I'm going to make putts and that's the only way you win a major or any golf tournament for that matter."