To follow-up on my hit post below, I wanted to present a little more info that shows how rare a major win over a ranked opponent truly is for most teams. I looked at our main rivals in chasing Ohio State (as they were going to be the obvious outlier) to see how they had fared since 2007 against teams that finished the season ranked.
Michigan State: 2-11
Michigan State's two wins both came in 2015. One, as we all know, came after one of the luckiest plays in college football history went their way against Michigan. The other was against Ohio State when Urban Meyer decided that Ezekiel Elliot was good at football for a night.
Penn State: 3-15
Had one truly impressive road win: 2008 against a good Ohio State team 13-6. They beat Northwestern in 2017 and surprised Wisconsin in 2013.
Wisconsin has not beaten a single team that finished the season ranked on the road since 2007.
This is something that just does not happen very often for most teams. These are three very successful programs and between them they have two elite wins on the road (2008 Penn State vs. Ohio State and 2015 Michigan State vs. Ohio State) as the others were either the result of absolute craziness or were against good, not elite teams.