The Wisconsin Badgers open the season against the Miami (OH) Redhawks as 17.5-point favorites according to FanDuel. This is a strong message by Vegas to set the odds this high, even though it's a Big Ten team versus a non-power team. More than a two-touchdown favorite is considered a heavy favorite, and as an example, Minnesota is only a 16.5 favorite right now against lowly Buffalo.
The Redhawks aren't a bad program, having won a bowl game last year with an 8-5 overall record (9 wins with the bowl win). They beat Colorado State in the Snoop Dogg Arizona Bowl 43-17.