The rivalry game between the No.
That game holds the audience record with 21M viewers on ABC.
In second place, by a wide margin, was the Alabama-Auburn Iron Bowl with 9M viewers.

Ohio State Buckeyes vs. Michigan WolverinesPhoto by Gregory Shamus/Getty Images
Thats still quite a large audience, considering the previous few weeks of college footballhad been quite sleepy.
In fact, its the largest audience for an SEC conference game this season.
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In third place was Washington State-Washington with 5.85M viewers on Fox.

As always, several networks are not Nielsen-rated, meaning their audiences arent reported week-over-week.