The Los Angeles Rams were one of the Super Bowl favorites going into this season. They've started 4-0 and sit at No. 1 in the ESPN NFL power rankings.
The Kansas City Chiefs have the most exciting offense in the NFL. Patrick Mahomes set an NFL mark by throwing 13 touchdown passes in the first three weeks of the season. The Chiefs are 3-0 and now are considered one of this season's Super Bowl favorites.
But there's one more unbeaten team left, and it's not a team anyone would have expected before the season began.