Posted by ESPN.com's Adam Rittenberg
The rankings return with the cornerbacks, followed by the safeties later. Malcolm Jenkins and Vontae Davis top the list, but things get a little bit cloudy after those two. Just a reminder that the rundown is only cornerbacks, so if you're looking for names like Anderson Russell, Anthony Scirrotto and Austin Thomas, check back in a bit.
1. Malcolm Jenkins, Sr., Ohio State -- It's a tight race with Davis for the top spot, but Jenkins gets the nod. He enters the fall as the Thorpe Award frontrunner after passing up NFL millions. The back-to-back first-team All-Big Ten selection had four interceptions last season and can shut down one side of the field.
2. Vontae Davis, Jr., Illinois -- His pro stock is skyrocketing and Davis soon will join his big brother Vernon in the NFL. Last season the Thorpe Award semifinalist had four interceptions, eight pass breakups, nine tackles for loss and two blocked punts, one of which he returned for a touchdown.
3. Lydell Sargeant, Sr., Penn State -- With Justin King gone, Sargeant moves into a featured cover role and has the tools to step up. In his first season as a starter he led Penn State defensive backs and ranked third on the team with 70 tackles. And Sargeant isn't afraid of big stages -- in March he was one of the introductory speakers at an on-campus rally of 22,000 people that featured presidential candidate Barack Obama.
4. Donald Washington, Jr., Ohio State -- His two-game suspension at the start of the season could hurt, but Washington has plenty of experience to readjust. Often overshadowed by Jenkins, Washington has big-play potential, as he showed by returning his lone interception last fall 70 yards for a touchdown.
5. Donovan Warren, So., Michigan -- One of the top young defensive backs in the league, Warren earned several freshman All-America distinctions last fall. He recorded 52 tackles and forced and recovered a fumble against Notre Dame. Like most Wolverines players, Warren improved his conditioning level this summer and should turn in a strong sophomore season.
6. Morgan Trent, Sr., Michigan -- The team's most experienced player has made 29 career starts in the secondary, collecting 108 tackles [92 solo] and 19 pass breakups. He earned honorable mention All-Big Ten honors last season. Trent has been burned at times by elite receivers, but he brings leadership to the secondary and complements Warren.
7. A.J. Wallace, Jr., Penn State -- Wallace turned heads as a freshman, playing on both sides of the ball and dazzling on kickoff returns and reverses. Hopes remain high for his progress at cornerback, as he moves into the spot vacated by King. After a superb Alamo Bowl performance [five tackles, interception, fumble recovery], Wallace should do big things this fall.
8. Bradley Fletcher, Sr., Iowa -- Charles Godfrey and Adam Shada had Iowa's starting cornerback spots on lockdown, but Fletcher still contributed with 53 tackles and two interceptions last fall. With those two gone, Fletcher steps into a featured role this fall. He has played a lot the last two seasons and should step up as a senior.
9. Allen Langford, Sr., Wisconsin -- How Langford responds following ACL surgery is critical, but he brings plenty of experience to a suspect Badgers secondary. He has six career interceptions and 19 pass breakups, including seven in 10 games last fall before the injury. If healthy, the fifth-year senior provides a big boost in the back half.
10. Kendell Davis-Clark, Sr., Michigan State -- Davis-Clark ranked second on the team in tackles  in his first season as a starter and should continue to progress this fall. He had eight pass breakups and was effective on blitzes with four sacks in 2007. Davis-Clark's next step is making more plays for a takeaway-starved Spartans defense.