Colorado 63, Oregon 62: Andre Roberson scored with 13 seconds left, and the Buffaloes upset the Ducks in the Pac-12 tournament quarterfinals when Devoe Joseph’s 3-point attempt fell short at the buzzer.

Carlon Brown scored 18 points on 7-of-13 shooting for sixth-seeded Colorado (21-11), which advances to face No. 2 seed California in Friday’s semifinals at Los Angeles. Roberson finished with 12 points and 10 boards.

The third-seeded Ducks (22-9) were led by Tony Woods’ career-high 14 points. Joseph, who averaged 21 points in two regular-season games against Colorado, had 12 points on 6-of-19 shooting.

Trailing 56-49 with 7:55 left, Oregon tied the game at 58-all on Woods’ jumper with 3:58 to go. Carlos Emory followed with a basket to give the Ducks their first lead since 29-27 with 5:06 left in the first half.

Joseph gave Oregon a 62-59 lead with two minutes left, but Brown and Roberson answered with consecutive scores to give Colorado the win.

GAME NOTEBOOK: After shooting 34.9 percent from the field in its first-round win over Utah, Colorado was 25 of 55 (45.5 percent) against the Ducks…Colorado has recorded back-to-back 20-win seasons for the first time in the program’s 111-year history…Oregon lost despite outrebounding Colorado 38-25…Oregon was just 4 of 22 (18.2 percent) from 3-point range.