Posted by ESPN.com's Adam Rittenberg
Every Big Ten team has a position group that generates more unease than confidence, whether it's because of personnel losses, youth or poor performances. Here's a look at the position on each squad that could make or break the season.
Running backs: The group struggled in the spring and offensive coordinator Mike Locksley let the players know about it. Junior Daniel Dufrene has stepped up in preseason camp to claim the starting job, and the Illini feel good about freshmen Jason Ford and Mikel LeShoure. But it's foolish to discount the value of Rashard Mendenhall, who finished eighth nationally in rushing average with 129.3 yards per game and 17 touchdowns last season.
Also keep an eye on: The safeties (two new starters)
Wide receivers: James Hardy finished his career as the most decorated wide receiver in team history, and his departure created a major void in the passing game. The coaches are counting on big things from Ray Fisher and Andrew Means, and former safety/quarterback Mitchell Evans should provide a boost. Indiana can't expect a receiver to match Hardy's production, but the group is capable of preventing a major drop-off.
Also keep an eye on: The offensive line (not much depth)
Offensive line: What was once the program's trademark has become an area of concern. Iowa ranked 114th nationally in sacks allowed (46) last season and is still waiting for several promising linemen to hit their stride. With questions lingering at both quarterback and running back entering the season, the Hawkeyes can ill afford major blocking problems.
Also keep an eye on: The quarterbacks (Jake Christensen struggled in '07)
Quarterbacks: Every area of the Michigan offense could fit in this category, but the unit's progress must start with the quarterbacks. Neither Steven Threet nor Nick Sheridan seamlessly fit Rich Rodriguez's system, and freshman Justin Feagin needs time to mature. The Wolverines need a game manager early on and can't afford turnovers from this position.
Also keep an eye on: The offensive line (four new starters)
Wide receivers: Illinois loses the Big Ten's top offensive player in Mendenhall, but Michigan State loses the league's top playmaker in Devin Thomas. Coach Mark Dantonio will lean on a young group featuring Mark Dell, B.J. Cunningham, Blair White and true freshmen Keshawn Martin and Fred Smith. The preseason has eased some doubt about this group, but the wideouts need to step up when it counts.
Also keep an eye on: The cornerbacks (two new starters)
Defensive backs: After finishing 115th nationally against the pass (289.3 ypg), the entire secondary needed major upgrades and got them from the junior college ranks. Two JUCO players are projected to start in safety Tramaine Brock and cornerback Traye Simmons, and hopes are high for cornerback Marcus Sherels, a converted wide receiver. The talent is there for a jump in production, but chemistry could be a challenge with so many new faces.
Also keep an eye on: The offensive line (lost three starters)
Offensive line: By far the biggest question mark on a veteran team, the line can't afford many growing pains to keep a bowl berth in the viewfinder. Three new starters join the group, including two on the all-important left side, so jelling quickly will be a challenge. If redshirt freshmen Al Netter and Ben Burkett meet expectations, the Wildcats should have a dominant offense this fall.
Also keep an eye on: The linebackers (new middle linebacker)
Defensive tackles: Not a lot of weak spots for the defending Big Ten champs, but the interior line looks a little iffy. Coordinator Jim Heacock has defended the group, pointing to its youth, but the Buckeyes need more play-making this fall from Cameron Heyward, Doug Worthington and Nader Abdallah.
Also keep an eye on: The safeties (more big plays)
Quarterbacks: The Nittany Lions usher in a new offense, the Spread HD, and need a capable trigger man in starter Daryll Clark or backup Pat Devlin. Both likely will play, though Clark starts Saturday against Coastal Carolina. The good news is the quarterbacks have plenty of weapons at the skill positions and play behind a veteran offensive line, but the inexperience at the position could lead to turnovers and other mistakes.
Also keep an eye on: The linebackers (inexperienced)
Wide receivers/tight ends: Purdue loses Dorien Bryant, who claimed 23 school and Big Ten records in his career, as well as underrated tight end Dustin Keller. Greg Orton is the only wideout with ample experience, and the Boilers will need help from Desmond Tardy, junior college transfers Aaron Valentin and Arsenio Curry and little-used seniors Brandon Whittington and Joe Whitest.
Also keep an eye on: The
linebackers (no depth)
Defensive backs: The Badgers lose their best cover man in Jack Ikegwuonu and endured their share of injuries at cornerback. Tackling has been a concern at the safety spots and Wisconsin needs continued growth from Shane Carter and Jay Valai. If cornerback Allen Langford remains healthy and regains his 2006 form, the secondary should be solid.
Also keep an eye on: The wide receivers (too many drops)