In conjunction with the release of the #NFLRank rollout on ESPN.com, Football Outsiders will provide an audit of the list, selecting the most overrated and underrated players revealed each day of the countdown.
Here are the most overrated and underrated players ranked 60-51 on both offense and defense:
Underrated
C.J. Spiller, RB, Buffalo Bills (No. 58)
Spiller
Last year, Spiller was the most efficient running back in the league on a per-play basis, according to Football Outsiders' DVOA ratings. Our metrics ranked him third in total rushing value behind only Adrian Peterson and Marshawn Lynch. Spiller is also excellent as a receiver: He ranked among the top 10 backs in receiving value last year, and has an above-average receiving DVOA in each of his three seasons.