2012 Indianapolis Colts
11-5 (2-14 in 2011)
Although not many expected the 2012 Colts to match the futility of the squad's 2-14 record in 2011, even fewer expected Indianapolis to win nine of its last 11 games and make the playoffs. All of this was done not with Peyton Manning at the helm -- he had been allowed to sign with the Denver Broncos -- but rather with rookie Andrew Luck and interim head coach Bruce Arians, who stepped in after coach Chuck Pagano was diagnosed with cancer. Running back Vick Ballard did his part by making plays like this dive across for a game-winning touchdown in overtime against the Titans. Here's a look at the biggest one-season turnarounds in NFL history.