What about Wisconsin?
At the time the loss to Wazzu was a loss to an unranked team and looked pretty bad for a B1G-W favorite. OTOH, Wazzu remains undefeated and is now ranked. I'll add that West Coast (and I'm including Wazzu even though I know they aren't actually "coastal") road trips are tough.
It is entirely possible that the Wazzu loss isn't all that bad, we'll find out quickly as Wazzu's next two games are against ranked OrSU and UCLA teams.
If Wisconsin is going to win the West, I see this game as not quite but almost a "must win". Sure, in theory they could struggle a bit then get things straightened out and finish strong and the B1G-W winner frequently has more than one loss but if the Badgers lose here their margin for error is nearly gone.
If Wisconsin can win here and at home against Rutgers after taking a week off, they should be ranked by the time they host Iowa on October 14. If they can't, it could be a long season in Madison.