Dri Archer, RB, Kent State: Injuries limited Archer this past season, but there's no questioning his explosiveness. He averaged 8.6 yards per carry over the last two seasons, and some consider him to be on De'Anthony Thomas' level in terms of speed and quickness.
Odell Beckham Jr., WR, LSU: He emerged as a big-play threat in 2013, averaging 19.5 yards per catch and scoring eight touchdowns. He has very good initial burst and good top-end speed.
Robert Herron, WR, Wyoming: He is a smaller-school burner who averaged 15.5 yards per catch over the past two years.
Marqise Lee, WR, USC: If Lee's 40 time matches up with the speed and explosiveness we see from him on tape, he'll be a contender. He's a big-time vertical threat who can take the top off a defense.
Loucheiz Purifoy, CB, Florida: He's still a bit of a project as a cornerback, but he is a very good natural athlete with very good top-end speed.
Bradley Roby, CB, Ohio State: Roby struggled with his discipline early on in the season, but he improved as the season went along, and his athleticism stands out on tape. He could climb up draft boards with a good 40 time.
De'Anthony Thomas, RB, Oregon: I don't know if I've ever seen a prospect look faster in a live game situation with the ball in his hands than Thomas. He's also a track guy, and was a Division I All-American in 2013 as the anchor leg of Oregon's 4x100-meter relay team.
Sammy Watkins, WR, Clemson: The top-ranked wide receiver prospect in our rankings, Watkins has elite acceleration and outstanding top-end speed on tape.
My picks are Thomas, Archer and Herron.