New England, the top seed in the AFC with a 13-3 record, and New Orleans, No. 3 in the NFC, haven’t lost in the second half of the schedule. Like Green Bay (15-1), both have dynamic, sometimes unstoppable offenses led by magnificent quarterbacks, bolstered by a deep and dangerous group of receivers.

All three also have so-so defenses that often require Aaron Rodgers, Drew Brees and Tom Brady to win shootouts. That’s a difficult way to prosper in the postseason, particularly when playing against a rugged, versatile defense such as the 49ers, Ravens and Texans possess.

“A lot of it is working on what we need to work on; working on things that have been a problem for us, that if they come up again we need to handle better,” Patriots coach Bill Belichick said, not mentioning in particular a penchant for falling into deep holes. New England rallied from 17-0 and 21-0 deficits to win its past two games.

Remember, also, that New England has lost its past three postseason games, including at home to the Ravens and Jets the past two years.

Behind Brees’ record-setting performances, the Saints soared past all eight opponents at home, but if they can handle the Lions next Saturday night in the Superdome, then they must head to San Francisco. And if they get by the formidable Niners, who rode a stingy, big-play defense to a 13-3 mark, a date at potentially frigid Lambeau Field is likely.

That is, if the Giants don’t start partying like it’s 2007. They were seeded fifth that year, but closed the regular season with a close loss to unbeaten New England. Then the Giants knocked off division winners Tampa Bay, Dallas and Green Bay before shocking the Patriots for the championship.

New York won three of its last four, including impressive defensive efforts in wins over the Jets and Cowboys to grab the NFC East title. Defense was an issue for much of the season, but with the pass rush suddenly reborn, the Giants can be dangerous.

“Different guys, different teams. I’d love to have the same ending as the ‘07 team,” Giants guard Chris Snee said. “We certainly have the capability of doing that, as we have shown. I’m happy just to be in the playoffs. We’ll take it from there. I don’t spend too much time reminiscing about that glorious time in our life.”

Baltimore, like New Orleans and Green Bay, went 8-0 at home and is an entirely different team on the road (4-4). Still, with some help from outside — ironically, the AFC North rival Steelers are the most likely to provide it — the Ravens might not have to leave the Inner Harbor to get to Indianapolis in February.