Spencer Dinwiddie scored a career-high 29 points and Andre Roberson added 15, helping Colorado hold off Colorado State 70-61 on Wednesday night.
Buoyed by a big first half, the Buffaloes (7-1) bounced back from their loss over the weekend to Wyoming, which dropped CU out of the AP poll.
Roberson added 14 rebounds.
The Buffaloes played in front of a Coors Events Center-record crowd of 11,708, and the noise clearly agitated the Rams (6-1) early as they trailed by 25 points in the opening half.
Colton Iverson scored 15 of his 19 points in the second half and grabbed 14 rebounds. Dorian Green added 18 points as the Rams fell a win shy of their best start in school history. They also were on the cusp of possibly appearing in the AP poll, something that hasn't happened since 1954.