Andrea Bills had 18 points and 15 rebounds and Oregon overcame a 14-point first-half deficit to upset Stanford (No. 6 ESPN/USA Today, No. 5 AP) 62-58.
Southern California -- which upset Stanford -- and upstart Oregon State will meet in Sunday's Pac-12 final, guaranteeing the league a new tournament champion for the first time since 2006.
Jillian Alleyne, Chrishae Rowe and Ariel Thomas combined to score 76 points and lead Oregon to a 98-90 upset of No. 20 Arizona State on Friday night.
Natasha Vital scored all 17 of her points in the second half to lead No. 9 California to a 56-45 win against Oregon State on Thursday night in a game that the Beavers led 13-11 at halftime.
Eleanor Haring scored 17 points to lead Oregon to a 62-42 victory over No. 22 California on Thursday night.
With Cathrine Kraayeveld scoring 23 points and Brandi Davis hitting two critical 3-point baskets, the 10th-seeded Ducks upset the seventh-seeded Lady Frogs 58-55 on Saturday in the first round of the NCAA Tournament.
When Corrie Mizusawa emerged from the locker room after Oregon's upset of No. 10 Stanford, fans at MacArthur Court gave her a standing ovation.
Hollye Chapman scored 22 points and had nine rebounds as Oregon State beat (No. 25 ESPN/USA Today, No. 23 AP) Washington 100-86 Thursday night.
Leilani Estavan had 20 points, nine assists and six steals as Oregon State beat Arizona (No. 22 ESPN/USA Today, No. 24 AP) 71-65 in overtime Thursday night.
Oregon's Kedzie Gunderson sobbed as she watched Stanford's Nicole Powell hit a pair of free throws with 1.3 seconds left. That's because she knew the Ducks' chance to pull off a major upset was gone.