I think Clemson beats them.
I think Florida would have a shot. Ohio State's defense has not been dominant and their secondary in particular has been susceptible and Trask, Pitts, Grimes, Shorter, and Toney would exploit that. Would be a shootout, so coin toss.
Cincinnati has a legit shot in my mind. They look fast, go fast, and have been relatively successful. Not many defenses will stop Ohio State, so this is another shootout like the Florida game. Toss up, but I think Cincinnati wins 3 out of 10 times here.
Notre Dame beat Clemson when they had their backup quarterback. DJ is as good as Fields, way better arm. Saying that, Notre Dame's defense can keep them in the game and allow their offense to put up some points. At this point, give me Notre Dame to exploit an Ohio State team getting the rust knocked off.
I say these teams because Ohio State has played a garbage schedule against no teams with talent that can mirror their own. Each of the teams I mentioned above either have the talent to go toe to toe or have gelled to a point where I feel they are more in sync as a team.
Texas A&M would get rolled by Ohio State in my opinion. Coastal Carolina would put up a good half before Ohio State's talent would take over. I feel the same way about BYU if they were still undefeated.