51. 2011 New York Giants
There is simply no denying that the 2011 New York Giants are one of if not the most improbable Super Bowl winners in history. They had a middling 9-7 record in the regular season, going 2-4 in their final six games. The Giants had to go play away games at Green Bay and San Francisco to make it to the Super Bowl. They earned that opportunity by beating Atlanta at home in the Wild Card game. Somehow they did all of that, even trouncing the feared Packers in Lambeau field. New York rode a fearsome pass rush to a win over New England in the 2008 Super Bowl. Their defense was far from that frightening in 2011, however, when they ranked 25th in the NFL by allowing 25 points per game.

Eli Manning did throw for a ton of yards with 4,933 total, however. He also had the Patriots’ number, something hardly anyone in NFL history besides him can claim. Manning and the Giants beat New England in the Super Bowl yet again when normally sure-handed wide receiver Wes Welker dropped a pivotal first down in the game. This team got sizzling hot at the right time and beat the NFL’s most successful juggernaut. How they did so based on their regular-season record will always be a marvel.