The Steelers lost to the Baltimore Ravens on a touchdown with seconds remaining. The Bears lost on Sunday Night Football to the Giants after Jay Cutler topped a record for most sacks in the first half of a game with nine.
That means it's the Chiefs who are the NFL's last remaining team.
Think about this: 2009 saw two teams at 13-0.
This year? It's just the Chiefs at 3-0.
So how did the Chiefs get there?
- Week 1 vs. San Diego Chargers: 21-14
- Week 2 at Cleveland Browns: 16-14
- Week 3 vs. San Francisco 49ers: 31-10
- Week 4 Bye
And here the Chiefs sit at 3-0 and on top of the NFL world, for a week at least.