Rivalries in sports go a long way to creating the type of energy that leads to the kind of popularity that leads to lots of money flying around. In the great State of Ohio, and in sports overall, there is no rivalry greater than The Ohio State Buckeyes vs the Michigan Wolverines.
In professional sports, the Cleveland Browns have an in-state rivalry with the Cincinnati Bengals but stronger ones with the Baltimore Ravens and Pittsburgh Steelers in the AFC North.