All have potent offenses, but the Cowboys have been playing shutdown defense of late.
The Cowboys led the NFC and ranked second in the NFL in scoring defense during the regular season, giving up just 15.6 points per game. Only the New York Jets (14.8) allowed fewer.
The Cowboys have been at their best the last month of the season. They held San Diego and New Orleans to their lowest outputs of the season, posted an NFL season-best nine consecutive scoreless quarters and pitched shutouts against the Washington Redskins and the Philadelphia Eagles during that stretch.
The Cowboys have won four straight games and have outscored their opponents 75-14 in the last three.
"I just think as we went along you could tell we were getting better and better, and it was harder and harder to score on us," Cowboys coach Wade Phillips said. "That was the factor, really. Good offensive teams couldn't score many points or couldn't move the ball that well, or we were making plays when we needed to make plays."
The Cowboys are getting after the quarterback with constant pressure and are not giving up big plays.
"We're just putting everything together," cornerback Mike Jenkins said. "We've played a lot of scrambling quarterbacks, too, so it's kind of hard just keeping those guys in the box, keeping them contained. (The front seven has) been doing a great job at just holding them down."
The Cowboys will be challenged by the Vikings' offense this weekend. But they are confident because no defense in the league is playing better.
"When you're playing as well as anybody in the league I think that's the key thing," Phillips said. "I think we're playing as good as anybody on defense."
Romo said there is no time to exhale now because there is still much left to do.
"I'm not to that point yet," Romo said. "Maybe when you're John Elway in your last year or two, maybe. But there's so much ahead for this football team.
"It just didn't feel like this was the most impossible thing ever that people made it out to be. And the other part is, and I told you guys this a million times, if you're good enough, you'll win. And if I wasn't good enough to win a playoff game as a quarterback, I never would have."