Winning or losing 10 straight games to open the season is a relatively rare occurrence.
A season in which teams have done both has happened only a handful of times before the Pittsburgh Steelers (10-0) and New York Jets (0-10) pulled it off this season.
This is just the sixth season in the Super Bowl era to feature both a 10-0 team and 0-10 team and first time it has happened since 2011. That year, the Packers went 15-1 before losing their first playoff game, while the Colts finished 2-14 after losing Peyton Manning to a season-long neck injury.