Patrick Mahomes told Bleacher Report this weekend that he's got his sights set on making the Kansas City Chiefs the first team ever to post a 20-0 record in a single season (including the playoffs).
That was technically possible even before the season expanded to 17 games because a team could have theoretically gone 16-0 and failed to secure a bye if other teams did the same thing and had the tiebreaker edge (just as 21-0 is now technically doable).
But realistically, 20-0 is the new 19-0—a mark nobody ever hit in the 16-game regular-season era thanks to the New York Giants' upset victory over the 18-0 New England Patriots in Super Bowl XLII.