Ron Dayne (1999)
During his four years at the University of Wisconsin, Ron Dayne set the the NCAA Division I-A rushing record for total yards in a career, and became one of the most decorated college football players ever. He won the Heisman Trophy, among a slew of other postseason awards, ahead of nominees like Michael Vick and Drew Brees.
But when he got to the NFL, Dayne’s size (approximately 250 lbs on a 5’10 frame) and lack of commitment to keeping his weight down frustrated New York Giants head coach Jim Fassel, who began to phase Dayne out of the offense. Dayne played a total of seven years in the NFL, and never ran for more than 800 yards or seven touchdowns in a given season.