Running back Dion Lewis shocked the world when he took over for Lesean McCoy as Pitt's starting running back. As a freshman Lewis went on to run for 1,799 yards and 17 touchdowns in his first season. He followed that up with another 1,000-yard year when he gained 1,061 yards and added 13 scores.
He left early for the pros and was taken in the fifth round of the NFL Draft the next year. Lewis, though, didn't have the same type of success early on.
Backing up McCoy for the Philadelphia Eagles as a rookie, he gained only 102 yards on limited opportunities.