Breaking down NFL combine DBs

When evaluating defensive backs, it is important to consider all aspects of their games -- instincts, coverage skills, ball skills and run support.

Below is an explanation of the categories in which Scouts Inc. grades defensive back prospects, as well as our ranking of all defensive backs invited to the 2013 NFL combine. Also included in this cheat sheet are five-year measurement and timing trends, picks from Rounds 1 and 2 of the 2012 draft, and recent DB market trends.

Prepares and knows opponents' tendencies. Reads keys, diagnoses information and reacts quickly. Above-average route recognition skills and tracks the ball well. Has "selective amnesia" and doesn't allow negative play to snowball into negative series, quarter or game. Is disciplined. Understands role and consistently executes assignment. Rarely gets caught peeking into the backfield; stays home against play action.