6. Doug Martin, Tampa Bay Buccaneers
The 2013 and ’14 seasons were utter disappointments for Martin, but last year, he again resembled the back that shined for the Buccaneers as a rookie. Bolstered by Jameis Winston’s arrival and improved O-line play, Martin averaged 4.9 yards per carry in 2015—better than every running back but Thomas Rawls and Ryan Mathews, neither of whom was a full-time starter. Martin chipped in 33 catches for 271 yards, as well. Despite his small stature, the 5’ 9”, 223-pounder is a load to bring down, and when he is going well, he can power through arm tackles just as effectively as he can spot a lane and turn the corner. Martin is a hard-nosed runner who should be able to maintain his current pace more effectively than he did after his rookie year.