Colorado's defense stifled San Diego State all night long Saturday and the Buffaloes had just enough offense to record a 20-10 win over the Aztecs at Folsom Field. The Buffs improved to 3-0 with the win and became bowl eligible for the first time since 2016. SDSU fell to 3-3 in a game that was scheduled Thursday night after both teams' original opponents were unable to play because of Covid-19 issues.