Here are five things to keep an eye on this week in the Pac-12.
1. The North remembers: There are four undefeated Pac-12 teams going into Week 5. By the end of it, at least one will have a loss. Undefeated Stanford and Washington square off in a battle that has tremendous implications within the North Division, the conference as a whole and, potentially, the College Football Playoff.
Both teams were pushed to the brink on the road last week, with Stanford scoring a last-minute touchdown to overcome UCLA and Washington needing overtime to escape Arizona unscathed.