Third-ranked Stanford won its rematch with No. 10 UCLA, 25-23, 25-16, 24-26, 25-23, Friday night to avenge one of its two Pac-10 losses.
The Cardinal moved into a first-place tie with California, which was upset by USC on Friday night. The Women of Troy swept the season series.
USC, a game behind the co-leaders, travels to Stanford for a 1 p.m. match on Sunday.
"We look forward to USC on Sunday," Stanford coach John Dunning said. "Now we're in a dogfight."
Senior outside hitter Alix Klineman recorded 20 kills, 12 digs and six blocks for her ninth double-double of the season. She also went over 1,800 kills for her career.
Senior all-around star Cassidy Lichtman had a double-double with 17 kills, 29 assists, seven digs and five blocks.
"This was interesting for us, getting back into a 6-2 with Cass and Karissa (Cook)," Dunning said. "We did a good job all week and worked as hard as we have all season."
Sophomore Hayley Spelman had 12 kills and three erros in 22 total attacks, a .409 hitting percentage. Freshman Carly Wopat tied her season high with eight blocks.
"It was a solid mental step for us to get through game four," Dunning said. "We made some good plays at the end."
Senior Gabi Ailes finished with 23 digs and three assists. She needs 22 digs to become the seventh player in Pac-10 history to reach 2,000 career digs.
As a team, Stanford hit .252, while holding UCLA to a .181 clip.
Middle blocker Stephanie Browne suffered a minor injury during the final set. Jessica Walker replaced her as the Cardinal finished off the victory.
"Sometimes you let games get away from you when a player goes down," Dunning said. "Jess went in and did a good job and everybody else stepped it back up."