Adrian Peterson
In hindsight, it seems laughable that people wrote Peterson off in 2012. The wide receiver came off a career season before he tore his ACL and MCL. Many armchair critics shook their heads and said that was the end of the Vikings’ running back. But he proved them wrong as he stormed back from his recovery.

Peterson won the NFL MVP award for his efforts in 2012. He also ludicrously played through a sports hernia for a chunk of the year as he showed his toughness. Some people think that he deserved the Comeback Player award instead of Peyton Manning too. But both men delivered in a unique year for the sport (via The Athletic).