Revised top 25 countdown: No. 21

No. 21. Chris Hairston, OT, Clemson

2010 numbers: He had 31 knockdowns in a team-high 821 snaps in 13 games (13 starts). He allowed just one sack and had at least one knockdown in every game.

Previous ranking: Not ranked.

Making the case for Hairston: He was a big reason Clemson ranked among the nation’s top 30 teams in sacks allowed. He was Clemson’s highest-rated offensive lineman in film grades in six games, and led the team with an 82.3 percent average.

No. 22 Anthony Allen, RB, Georgia Tech

No. 23 Brandon Washington, OL, Miami

No. 24 George Bryan, TE, NC State

No. 25 Conner Vernon, WR, Duke