Combine players with most to prove

Kevin White's 40-yard dash will be a determining factor in his draft stock. Scott Clarke/ESPN Images

Every year, the NFL scouting combine plays a determining factor in how prospects are viewed by NFL teams, but some prospects have more on the line than others in Indianapolis this week. This includes players with the most to prove and/or gain during the measurements and athletic testing portions of the weeks, players with the most riding on their interview sessions, players with the most riding on their medical testing and players most likely to post the fastest 40-yard dash times (and that's not even taking into account that putting up a fast time could land players a Porsche this year).

Let's take a look at the players in each group:

Five players with the most on the line during workouts:

Kevin White, WR, West Virginia: The big thing for White is his 40-yard dash. On tape, he has almost everything you look for in a wide receiver prospect: He has very good size (6-foot-3, 211 pounds), he has outstanding ball skills, and he put up exceptional numbers -- and did so against very good competition (including 35 combined catches versus Alabama, Oklahoma and Texas). The only issue is on tape he doesn't appear to have elite, top-end speed. He is already a likely top-20 pick and the second-ranked receiver on our board, but if he can run in the 4.4s, he could be the first receiver drafted and go in the top 10.

Arik Armstead, DE, Oregon: