7. 2008: BenJarvus Green-Ellis
After going undrafted out of Ole Miss, Green-Ellis struggled at first to catch on with a team. He was, however, given a chance by the New England Patriots. He did not see any action until Week Six of his rookie year. Green-Ellis used that opportunity to become one of the most consistent running backs in the NFL.
Green-Ellis started his career by setting a NFL record, going 589 carries to start his career without fumbling the football. He used this consistent approach to gain 3,158 yards and 35 touchdowns during his career so far.