Lucas Siewert had 16 points and 10 rebounds, Evan Battey added 12 points and 10 boards, and No. 23 Colorado beat Washington State 78-56 in Boulder, Colo., on Thursday night.
D'Shawn Schwartz added 13 points and McKinley Wright IV had 10 points and 10 assists for the Buffaloes (15-4, 4-2 Pac-12).
CJ Elleby scored 15 points and Daron Henson had 13 for the Cougars (12-8, 3-4). Washington State scored just six points in the final 12:12 of the game.
The Cougars' Isaac Bonton hit the first basket of the second half but a layup by Wright, a 3-pointer by Shane Gatling and a layup by Battey gave Colorado a 47-36 lead with 16:04 left.
Washington State slowly got back within striking distance. Elleby scored five straight points and Henson hit a 3-pointer to cut the deficit to 49-44. Bonton's 3-pointer made it 54-50 but then the Buffaloes started to pull away while the Cougars went cold.
Wright hit a jumper and, after Bonton missed a layup, Siewert's 3-pointer stretched the advantage to 59-50. Elleby split two free throws, then the teams traded empty possessions before Maddox Daniels made a 3-pointer and Daylen Kountz hit a jumper to put the Buffaloes up 64-51 with 8:48 remaining.
Washington State missed nine straight field goals and had two turnovers during a stretch without a basket that lasted 6:46. Jervae Robinson broke the drought with a 3-pointer with 5:26 left.
Daniels answered with a 3-pointer and Battey hit a layup off an offensive rebound to make it 71-53 before the final media timeout. Siewert sank four straight free throws and Dallas Walton converted a three-point play in the final minutes to put Colorado ahead by 22.
The Buffaloes hit 50 percent of their shots in the first half and led by as many as seven after a 10-2 run. The Cougars got back within 36-33 on a three-point play by Noah Williams. Wright made two free throws with one second left to give Colorado a 38-33 lead at intermission.
--Field Level Media