Associated Press

The sleepers are for real. Buffalo and Detroit proved their doubters wrong with big comeback wins. They stand with the defending champion Packers as the only undefeated teams left in the NFL. But do they really belong with the league's elite? Here are our top 10 teams going into Week 4 of the NFL season.

10 Houston Texans (2-1)
Associated Press

Houston let a 9-point fourth-quarter lead slip away against the Saints. No real shame in that, but if the Texans want to be taken seriously as a contender, those are the kinds of games they need to win.

9 San Diego Chargers (2-1)
Associated Press

It wasn't as easy as they might have hoped, but the Chargers held off the Chiefs last week. The better news is that running back Ryan Mathews finally seems to be living up to his potential.

8 Pittsburgh Steelers (2-1)
Associated Press

The Steelers needed a late drive to seal a comeback win over the Peyton Manning-less Colts. They'll need to play much, much better if they want to beat the Texans this week and stay contenders in the AFC.

7 New York Jets (2-1)
Associated Press

A surprising loss to the Raiders has the Jets in a tough situation -- they play at Baltimore and at New England in the next two weeks, and they have to face the Chargers two weeks after that. We'll find out what this team is really made of very soon.

6 Baltimore Ravens (2-1)
Associated Press

The Ravens bounced back from a bad loss at Tennessee by thumping the Rams on the road. They host the Jets this week in a battle to prove who should stay in the AFC elite.

5 Detroit Lions (3-0)
Associated Press

Okay, so they haven't played a really tough team yet, and they needed an overtime comeback to beat the Vikings last week. But the Lions have shown grit and toughness beyond the tender years of their offensive leaders. This week's game at Dallas could be a real test.

4 New England Patriots (2-1)
Associated Press

Wow. Who saw that coming? Tom Brady threw four interceptions in the Pats' stunning loss to the Bills, and New England's pass defense ranks dead last in the NFL. Fortunately, this week's opponent is Oakland, a power-running team. Expect the Pats to bounce back.

3 Buffalo Bills (3-0)
Associated Press

Ryan Fitzpatrick, Fred Jackson and the Bills proved all the doubters wrong in their defeat of the Patriots. Are they really the best team in the AFC? We'll see over the course of the season, but they've done everything you could ask for so far.

2 New Orleans Saints (2-1)
Associated Press

After squeaking out a win over the Texans, the good news for the Saints is that they face a weak Jacksonville team on Sunday. The better news is that New Orleans' offense is still explosive without injured receiver Marques Colston.

1 Green Bay Packers (3-0)
Associated Press

Still undefeated and still looking strong, the champs rolled past Chicago and will face the Broncos at Lambeau Field on Sunday. Look for Green Bay to make it 4-0 without too much trouble.