There are upsets and then there are come-from-behind upsets. The Cleveland Browns did both Sunday against the Green Bay Packers, overcoming a 10-point deficit in the final four minutes thanks to a blocked field goal and a 55-yard walk-off field goal of their own in a dramatic 13-10 win. The previously winless Browns beat the previously unbeaten Packers for the biggest upset of the NFL season to date, according to ESPN BET.