Red-flag NFL draft prospects

Jadeveon Clowney was plenty productive in 2013, but he made just two "one-on-one" sacks. Streeter Lecka/Getty Images

Most of the NFL draft discussion this time of year revolves around the strengths of blue-chip prospects, but just as much attention should be paid to the red flags of some of these prospects. It takes just one significant weakness for a player to go from productive selection to a pick that doesn't pan out, and some of the elite talents in this year's draft crop have this flaw, in the form of a metric red flag that suggests some level of buyer beware should be in order.

Jadeveon Clowney, DE, South Carolina Gamecocks

Red flag: low volume of one-on-one sacks

There have been a litany of reasons to account for Clowney's decline to three sacks this past year, but the truth of the matter is he hasn't fared well in the one-on-one sack category over the past two seasons.

A one-on-one sack is defined as a defender beating a blocker and getting to the quarterback in the pocket within three seconds of the snap. The importance of this metric is that it illustrates the ability to generate a pass rush without any play-calling bells and whistles.