Ochoa, the top-ranked Mexican star who also won the 2006 tournament at Tres Marias, eagled the par-5 eighth hole and had six birdies. The fifth-ranked Pettersen shot a 64.
I do not feel the pressure. I dont have to. Im going to play with joy. Suzann is a very good player, very aggressive. She had a great round.
Second-ranked Yani Tseng (66) and Na Yeon Choi (69) were five strokes back at 11 under, Kristy McPherson (68) was 10 under, and Michelle Wie (71) was 9 under along with Sarah Lee (70), Karrie Webb (67), Irene Cho (67) and Brittany Lang (68).
It was kind of frustrating today, said, Wie a stroke behind Ochoa on Thursday after a 66. I did not make a single putt out there today. Hopefully tomorrow I will make some birdies. Its going to be a great weekend. I am really looking forward to it. Its just a privilege to be able to play with the best players in the world.
Brittany Lincicome, coming off a major victory in the Kraft Nabisco on April 5, followed her opening 75 with a 73 to miss the cut.
Ochoa opened her season with a victory in the Honda LPGA Thailand, her 25th LPGA title. She tied for 12th in the Nabisco in her last start.