Robert Griffin III
A fairly recognizable face on this list because he is still moderately active even now, Robert Griffin III had a promising career with the Washington Redskins. In 2012, after throwing for 20 touchdowns during that season, he was named Offensive Player of the Year, but he would never again reach those same heights. A playoff game against the Seattle Seahawks saw him sustain a knee injury that effectively rendered his career obsolete. He played so poorly when he returned that the Redskins inactivated him for the last three games of that season to prevent him from sustaining any more injuries. They subsequently let him go, as well.