First let me answer my own question. Clemson is very good. They are favored by 9 and killed us in our last meeting. That said, they are beatable.
If you look at the Tigers' profile and season, you'll see that they are strong on both ends of the floor. Their perimeter D is strong and they block shots too. Last time around we even had a few shot clock violations just trying to get something set up. To beat them tonight, we need to remain patient but also move and rotate the ball more effectively.
The keys to an upset:
-- Offensive rebounds
-- Not turning it over
-- Perimeter D
The other aspect of tonight's game that gives me hope is Clemson's road record. Away from Littlejohn, they are only 6-6 against BCS teams this year.