» Mayock's positional rankings

With several pro days down and many more yet to go, here is a look at the latest top 20 list.

1. Gerald McCoy, DT, Oklahoma

McCoy is incredibly disruptive for opponents' passing games.

2. Ndamukong Suh, DT, Nebraska

Suh is a tremendous all-around defensive tackle.

3. Dez Bryant, WR, Oklahoma State

Bryant is reminiscent of Andre Johnson, but his off-field issues need to be qualified.

4. Sam Bradford, QB, Oklahoma

Bradford is very accurate and poised in the pocket, but his durability is a concern.

5. Russell Okung, OT, Oklahoma State

Okung is a top-10 caliber left tackle, but needs more consistent technique.

6. C.J. Spiller, RB, Clemson

Spiller has the speed to go the distance, and is a threat as a receiver, rusher and returner.

7. Earl Thomas, S, Texas

Thomas is the draft's most instinctive safety, but will his size limit him?

8. Bryan Bulaga, OT, Iowa

Bulaga is a technician who was taught well by Iowa's Kirk Ferentz. His short arms are a concern.

9. Joe Haden, CB, Florida

Haden has quick-twitch muscles and is great at changing direction. He is surprisingly physical.

10. Eric Berry, S, Tennessee

Berry has all-pro tools, and a great all-around game.

11. Jason Pierre-Paul, DE, South Florida

Pierre-Paul is an explosive physical talent, but is raw and inexperienced.

12. Trent Williams, OT, Oklahoma

Williams can be a swing tackle, but will off-field issues affect him?

13. Derrick Morgan, DE, Georgia Tech

Morgan has a great motor and was very productive in college. He gets off the ball quickly.

14. Dan Williams, DT, Tennessee

Williams is a massive interior presence, and has better feet than expected.

15. Sergio Kindle, DE/LB, Texas

He is an explosive edge pass rusher as an edge defensive end/outside linebacker. He is a playmaker.

16. Rolando McClain, LB, Alabama

McClain is a prototypical inside linebacker for the 3-4, and can also play the strongside.

17. Jermaine Gresham, TE, Oklahoma

Gresham is a game-breaking tight end, but the torn ACL he suffered last year needs to be qualified.

18. Brandon Graham, DE, Michigan

Graham is scheme diverse, and had a great Senior Bowl week.

19. Maurkice Pouncey, C, Florida

Pouncey is a first-round center that can anchor and pull.

20. Jimmy Clausen, QB, Notre Dame

He can make all the NFL throws, but his intangibles need to be looked at closely.

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