The Patriots became the fourth team to clinch a division title, the Browns kept the Ravens alive and the 49ers moved closer toward a No. 1 seed.
There's plenty left to be settled before the NFL's playoff schedule is set.
Twelve of the 14 playoff berths have been secured and four teams are battling for the final two spots. Both No. 1 seeds are up for grabs and there could be two winner-take-all games in Week 18.
New England (13-3) routed the Jets 42-10 on Sunday and later clinched the AFC East title when the Bills lost to the Eagles 13-12. The Patriots completed a worst-to-first turnaround under first-year coach Mike Vrabel. The NFC North champion Bears also went worst to first this season.
Aaron Rodgers and the Steelers missed an opportunity to lock up the AFC North, losing 13-6 at Cleveland. Now, the division championship comes down to the final game when Baltimore (8-8) visits Pittsburgh (9-7). The winner advances; the loser is eliminated.
That's likely the scenario when Carolina (8-8) plays at Tampa Bay (7-9) next Saturday. If the Falcons lose or tie the Rams on Monday night, the Panthers-Buccaneers matchup will be winner-take-all. If Atlanta (6-9) wins its final two games, the Panthers are in the playoffs regardless of what happens against Tampa Bay because they hold the three-team tiebreaker.
San Francisco's 42-38 victory over Chicago set up a showdown against Seattle next Saturday night for the NFC West title and the No. 1 seed.
The Broncos (13-3), Patriots, Jaguars (12-4), Texans (11-5), Chargers (11-5) and Bills (11-5) have secured playoff spots in the AFC.