... USA Today coaches' preseason poll was released on Thursday with very few surprises.

The conference breakdown of the Top 25 looks like this:

SEC: Eight
Big Ten: Five
Big 12: Five
Mountain West: Two
Pac-12: Two
ACC: Two
Independents: One
Big East: Zero

Even though these contending teams are going to be tough to handle in both non-conference and league play, each of these squads have some question marks going into this year.

Let's take a quick look at the biggest challenges facing the best of the best....each of the Top 10 teams.

Bleacher Report - College Football