Aaron Gordon added 12 points for Arizona, which overcame a three-for-15 night from three-point range and some missed free throws down the stretch to extend the best start in school history.
A year after nearly pulling off an upset in the desert, Colorado (15-5, 4-3) had no chance for late-game heroics in its third game without leading scorer Spencer Dinwiddie. The Buffaloes struggled to slow Arizona's bevy of scorers and couldn't overcome the big early hole, falling to 0-16 all- time against No. 1 teams.
Xavier Johnson led Colorado with 21 points and Josh Scott added 15.
at Arizona State 79, Utah 75: Jahii Carson scored 23 points, eight in a decisive five-minute span late in the game, as the Sun Devils held on to beat the Utes.
Jonathan Gilling added 13 points, making all three of his three-pointers, including a critical one coming with 1:40 to play for Arizona State (14-5, 3-3 Pac-12), which had Jordan Bachynski finish with 11 points and 12 rebounds.
Utah (14-5, 3-4) led by as many as nine in the first half and was up 41-37 at the break. Shaquielle McKissic added 11 points for Arizona State, which had lost two in a row.
Wilcox scored six points in the final 2 1/2 minutes as Washington (12-8, 4-3 Pac-12) held off Oregon (13-5, 1-5) down the stretch, extending the Ducks' losing streak to five games.
Andrew Andrews added 17 points for Washington.