Posted by ESPN.com's Heather Dinich
1. Clemson -- The Tigers return three starters up front, and first-year defensive coordinator Kevin Steele's pressure defense is the perfect fit for guys like Da'Quan Bowers and Ricky Sapp. Sapp was having a good season last year before he tore his ACL at Virginia and missed the rest of the season. Defensive end Kevin Alexander is a returning starter who had 34 tackles last year, and nose guard Jarvis Jenkins tied Sapp for the team lead with 10 tackles for loss. Opposing quarterbacks won't have time to think against this bunch.
2. Miami -- Anyone watching the Virginia Tech game last year saw what this group is capable of, and of the nine linemen who started at least one game for Miami last year, seven are back. Allen Bailey has moved from end to tackle, but he sometimes played there in third-down situations. He led the team with five sacks. Marcus Robinson is a solid pass rusher, Marcus Forston could also be an impact and Eric Moncur is entering his sixth season and if he plays like he did in 2007 (11.5 tackles for loss) could really give this line a boost.
3. Virginia Tech -- Depth is the only question mark here, as Jason Worilds, John Graves, Cordarrow Thompson and Nekos Brown are more than capable of continuing Bud Foster's tradition of nationally ranked defenses. Nobody is questioning Worilds' toughness, that's for sure, and Graves and Thompson both started every game last year. They're still looking for another defensive end, though, and will keep an eye on what Chris Drager adds to the position after moving from tight end.
4. North Carolina -- Not only do all four starters return, but the depth is the best it's been in recent years. Last year, defensive end Robert Quinn became a starter in the second game of the season, and defensive tackle Cam Thomas had one of his his best season at UNC. Marvin Austin and E.J. Wilson played well, and should be even better this year. Reserves Quinton Coples and Michael McAdoo had solid rookie seasons and will push Wilson and Quinn for playing time this year. Aleric Mullins and Tydreke Powell are interchangeable with Austin and Thomas as starters at tackle.
5. Florida State -- The end position is reason for concern, as the Noles have to replace both Everette Brown and Neefy Moffett, who were first and second, respectively, on the team in sacks. Markus White will be tasked with filling the shoes of Brown, but he had a good transition season from junior college last year to build off of. Kevin McNeil, who had four sacks last year, is the favorite to replace Moffett. The interior should be solid with the return of Budd Thacker, Kendrick Stewart, Moses McCray and Justin Mincey.
6. NC State -- Defensive tackle Alan-Michael Cash and end Willie Young have combined for 46 starts and should be two of the best linemen in the conference. The other two players penciled in as starters -- Shea McKeen and Leroy Burgess -- were both junior college transfers who earned starting time last year. Backup tackles will be a concern, but Markus Kuhn could wind up playing a bit of both until the staff decides where he can help the most.
7. Wake Forest -- Tackles John Russell and Boo Robinson will highlight a defense that recently bid farewell to some of the best seniors to come through the program. It should be one of the Deacs' most experienced groups in recent years, which is important considering the new faces behind them at linebacker. Defensive end Kyle Wilbur showed a lot of promise as a redshirt freshman with three sacks in only seven starts, and Tristan Dorty played in 10 games as a redshirt defensive end last year.
8. Virginia -- It's one of the few units on this team that didn't get a complete makeover, as seven of the top eight linemen return. Sophomore Matt Conrath, who had 35 tackles and four sacks last year, returns at end. There's a lot of experience next to him at nose tackle, where senior Nate Collins and sophomore Nick Jenkins split time last season. Collins' 35 tackles are the top among the returning linemen, while Jenkins finished with 25. Junior John-Kevin Dolce proved himself in the pass rush package with five sacks among his nine total tackles last year.
9. Boston College -- Replacing tackles B.J. Raji and Ron Brace is obviously one of the biggest concerns for this team, but they've got several options. Damik Scafe, Nick Rossi and Brendan Deska were each second-stringers at the tackle position and are the early favorites to replace the NFL draft picks. The Eagles also signed a pair of defensive tackles in the offseason, including highly touted recruit Dillon Quinn, who could make an immediate impact. Austin Giles replaced the injured Alex Albright last year for 12 starts, and Jim Ramella started all 14 games at the other end position.
10. Georgia Tech -- The Yellow Jackets have to replace three of four starters up front, and until they prove they found dependable replacements, they're going to be stuck down here. The lone returning starter is junior end Derrick Morgan, and there's no doubt about his capabilities, but the Jackets will sorely miss the three starters who combined for 100 career starts and 100 tackles for loss. Ben Anderson, Robert Hall and T.J. Barnes are all candidates to start.
11. Duke -- The Blue Devils took a step forward last year and should improve again with the return of tackle Vince Oghobaase and end Ayanga Okpokwuruk, who started five games and had 6.5 tackles for loss and 3.5 sacks. They combined for 9.5 sacks last year. Oghobaase ranks second in the ACC in both career tackles for loss (29.0) and quarterback sacks (11.5). They'll need new starters at nose guard and right end.
12. Maryland -- The Terps have to fill a void left by Jeremy Navarre and Trey Covington, and so far it looks like that will be up to Derek Drummond, Dion Armstrong, Travis Ivey and Jared Harrell, though Armstrong was dealing with some academic issues. The arrival of De'Onte Arnett, Zachariah Kerr, and Cody Blue this past spring should help with the depth.