The Mexican star, making her first start since tying for sixth in the Safeway Classic on Aug. 24, matched Louise Friberg (65) at 13-under 203.
"It was a little bit tougher today for me," Ochoa said. "I didn't feel a great rhythm with my irons, with my swing. So I was struggling a little bit, but I was able to finish under par and I think that's always good."
Ochoa has four top-seven finishes in a row, but is winless in seven starts. She opened the year with six wins in nine events, including four in a row.
Friberg had seven birdies in her bogey-free round.
"I've actually been waiting for this for quite some time, because my last win, I came from far behind, so I've been waiting to get up to the top to get to learn the Sundays, how they work and how to be in contention and manage to keep it," Friberg said.
CHAMPIONS TOUR: In Cary, N.C., Bruce Fleisher moved into position for his first Champions Tour victory in four years, shooting 6-under-par 66 to take a one-stroke lead into the final round of the SAS Championship.
"It's an unusual position. I haven't been there for a while," Fleisher said. "On the greens, I felt good through 12 or 13 holes. But then, I lost pace a little bit. I got tentative."
Fleisher had a 10-under 134 total on the Prestonwood Country Club course.
Tom Kite (66) and Eduardo Romero (67) were tied for second. Mark McNulty (63) and John Cook (66) were another stroke back at 8 under.
Augusta native Larry Mize followed his first round on the Champions Tour by shooting 71, leaving him tied for 23rd place at two-under 141.
EUROPEAN TOUR: In Sutton Cold-field, England, Charl Schwartzel, of South Africa, held the clubhouse lead when play was suspended because of darkness in the third round of the British Masters.
Schwartzel shot 6-under-par 66 to total 6-under 210 at The Belfry. He was among the 24 players who completed the round before it was halted.
Fog delayed play more than three hours on Friday, and caused a shorter stoppage Saturday.