American Angela Stanford shot a six-under 66 to vault past first-round co-leader and former World No. 1 Anika Sorenstam after the second round of the Lorena Ochoa Invitational on Friday.

Stanford was part of an eight-way tie at the top of a crowded leaderboard on Thursday that included England`s Karen Stupples, who is competing here with a broken toe on her right foot.

Stanford, who won the Bell Micro LPGA Classic in September, seized control Friday with four birdies over the first nine holes.

She added three more birdies on the back nine to move to 10-under heading into Saturday`s third round of the one million-dollar event.

Her only major blemish of the day came on the 12th hole where she posted a bogey.

Taiwan`s Yani Tseng is two shots back in second after firing her second consecutive 68 on Friday.

South Korea`s Meena Lee (69) was in third while Stupples (71) was lying fourth.

Stupples had to play through the pain of a broken middle toe on her right foot. She suffered the injury on Wednesday while rushing to get a cup of coffee.

Her steady second round included birdies on the third and 18th holes.

A half dozen players are tied for fifth, including Sorenstam who is looking for her fourth LPGA Tour victory of the season.

Sorenstam was a co-leader after the first day and looked strong for most of Friday, but bogeyed three of the last four holes and finished the day at even par.

The tournament`s namesake Ochoa recovered from a disappointing performance in the first round with a 71, but remained tied for 22nd in the 36-woman field.

In search of her eighth victory of the season, Ochoa has locked up the Player of the Year honors and is the star attraction in her native Guadalajara.

The event is serving as the final tune-up for players competing in the 2008 ADT Championship.