Arizona State was undefeated in its short football series history against Colorado before last year's 40-16 loss in Boulder, the first for the Buffs in eight meetings.
Before that, it had been all Sun Devils going back to two pre-Pac-12 games in 2006 (21-3) and 2007 (33-14). The conference expanded in 2011 with Colorado going into the South division, which includes an annual football meeting against ASU.
Here's five things to know going into Saturday's 6 p.m. game at Sun Devil Stadium:
Repeating is not easy
No one really expected the Buffs to repeat as Pac-12 South champions, particularly because of defensive losses and general inexperience.