Ochoa, the top-ranked Mexican star who also won the 2006 tournament at Tres Marias, had a 20-under 199 total. After opening with consecutive bogey-free 65s, she had eight birdies, two bogeys and a double bogey Saturday.
I was aggressive, but I cant be perfect every day, Ochoa said. I missed a couple of shots, and thats just the way golf is. Im still happy because Im still on the lead and the goal is to remain there. Sunday will be complicated. Nothing is going to be easy. Suzann has the desire. So do I. I have to respect her.
The fifth-ranked Pettersen followed her second-round 64 with a 67. She eagled the par-5 eighth and had four birdies, but failed to convert a short birdie chance on 18.
Whatever happened, happened, theres nothing you can do about it. Im happy because there are still 18 holes to play, Pettersen said. It was a good round, not perfect. I managed to gain ground on Lorena, which was one of my goals. Hopefully tomorrow, I can go out and shoot as low as I can.
Na Yeon Choi (69) was third at 15 under, Wendy Ward (66), Morgan Pressel (67) and Irene Cho (68) were 14 under, and Cristie Kerr (66) and second-ranked Yani Tseng (66) were another stroke back.
Michelle Wie was tied for 13th at 10 under. She shot a 72 after opening with rounds of 66 and 71.