12. Ndamukong Suh
Suh definitely didn’t have the worst sophomore slump on this list, but he wasn’t as effective as in his rookie year with the Detroit Lions. The defensive end made the Pro Bowl in a highly effective season where he won the Defensive Rookie of the Year award.

However, his numbers dropped in his second year. Suh took some time to change his approach because he was in danger of becoming one-dimensional. The NFL also banned him for several games for stomping on Evan Dietrich-Smith. But he turned things around and has had a superb career.