The No. 7 Cardinal (14-17) advanced to Friday's semifinals against the winner of the late game between No. 3 Washington and sixth-seeded Oregon State.
Arizona State (22-10) swept the Cardinal during the regular season for the first time since 2004-05. But on Thursday the Sun Devils led just once -- by one point early in the second half. Rihards Kuksiks scored 15 points, all in the first half, before he fouled out in the closing seconds.
Stanford immediately grabbed the lead back for good, running up a 15-point advantage on a 3-pointer by Fields with 11:43 remaining. It capped eight straight points by the first-team All-Pac-10 senior.