Rancho Mirage, CA (My Sportsbook) - Defending champion Yani Tseng matched the low round of the tournament on Saturday with a six-under 66 and moved atop the leaderboard after three rounds of the Kraft Nabisco Championship, the LPGA Tour's first major of 2011.

Tseng finished 54 holes at 12-under 204 and is two strokes clear of second- round leader Stacy Lewis, who posted a one-under 71 on Saturday at Mission Hills Country Club.

Morgan Pressel, the 2007 winner, had a three-under 69 and is alone in third place at eight-under 208.

Michelle Wie also carded a 69 to move into fourth at minus-six.

Tseng, the No. 1 player in the world, was brilliant on Saturday with six birdies and no bogeys. She was three down to the start the third round, but the five-shot difference between herself and Lewis gave her a somewhat comfortable margin heading into Sunday's final round.

Tseng will be in search of her fourth major championship. She won the 2008 LPGA Championship and captured this event and the Women's British Open last year.

Tseng cut into the deficit early on Saturday with a birdie at the par-five second hole. She rolled in a 20-foot birdie putt at the fourth and was only a stroke down.

Three holes later, Tseng sank another 20-footer for birdie and she was tied for the lead with Lewis.

But Lewis hung tough. She rolled in a seven-foot birdie putt at the par-five ninth to move one clear of Tseng. That lead was short-lived because Tseng tied her again with a 10-foot birdie putt at the 10th.

At the par-five 11th, Tseng hit the hole with her second and nearly recorded the rare double-eagle, or albatross. The ball rolled 12 feet past the stick and Tseng didn't make the eagle try. She settled for the tap-in birdie and was back in the lead by one.

Once again, Lewis responded. At the 13th, she knocked her approach to two feet and kicked in the short birdie putt to match Tseng in first at 11-under par.

Tseng ran home a 12-foot birdie putt at the 15th to reach 12-under par and inch in front. Lewis blinked first and made a bogey at the 16th to make the cushion two for Tseng.

Neither player in the final group played the par-five 18th well. Neither found the short grass off the tee and neither found the fairway with their lay up shots.

Lewis found the rough with her second and knocked her third to a safe spot on the green. Tseng landed in a bunker with her second and couldn't attack the flag with her third.

Both saved par, although Lewis needed to make a six-footer.

So that means Tseng will go into the final round armed with a two-shot lead.

"I did it before," Tseng, 22, said in a televised interview. "It's really exciting. I feel really appreciative. I want to go out and enjoy myself. Hopefully tomorrow will be good."

For Lewis, her chances at not just major No. 1, but win No. 1, are still alive.

"I think I have to go out there and shoot a pretty low number," Lewis said in a televised interview. "You can't ask for better. I'm looking forward to tomorrow already."

Angela Stanford shot a five-under 67 and moved into fifth at five-under 211.

Mika Miyazato (70), Chie Arimura (71) and 2009 champion Brittany Lincicome (74) share sixth at minus-four, while Jimin Kang's even-par 72 left her in ninth at three-under 213.

NOTES: Tseng can become the first player since Annika Sorenstam (2001-02) to win this title in consecutive years...Tseng has six LPGA Tour victories, including this year's Honda LPGA Thailand.