Updated

Nnemkadi Ogwumike scored 18 points to help second-ranked Stanford beat Washington 76-57 Thursday and advance to the semifinals of the Pac-12 tournament.

Younger sister Chiney Ogwumike had 16 points and 11 rebounds, and Bonnie Samuelson scored 11 points on three 3-pointers for the top-seeded Cardinal (29-1), who pulled away after halftime in their first game following a first-round bye.

Stanford is looking for a ninth straight conference tournament title. The Cardinal will play Friday against the winner of Arizona-Arizona State.

Regina Rogers, Mackenzie Argens and Aminah Williams each scored 12 points for eighth-seeded Washington (17-13), which dug itself a hole by shooting 25.8 percent and committing eight turnovers in the first half.

Nnemkadi Ogwumike shook off a bloody nose and showed why she was the Pac-12 player of the year. The senior forward made eight of 13 shots and keyed a second-half run that resulted in the game's largest lead.