Here are six things to watch - three for each of Sunday's NFL conference championship games - as four teams battle to determine this year's Super Bowl matchup.
Here are six things to watch - three for each of Sunday's NFL conference championship games - as four teams battle to determine this year's Super Bowl matchup:
AFC Championship Game: Patriots at Broncos, 3 p.m. EST
1. Tom Brady vs. Peyton Manning
Ok, so this one is obvious, but it's also absolutely mandatory. No quarterback rivalry in the history of the NFL has been as compelling as the 12-season duel between Tom Terrific and The Sheriff.
These two sure-fire first-ballot Hall of Famers will share the same field today for the fourth time in the postseason and the 15th time overall. Brady has gotten the better of Manning more often than not over the years, winning 10 of their 14 career meetings including a 34-31 overtime win in Foxborough earlier this season.
But today's Brady-Manning clash could play out much differently than some of their gunslinging showdowns of the past.
Without their customary weaponry in the passing game, Brady and the Patriots have adopted a ground-and-pound persona in recent weeks. Brady attempted just 25 passes in a 43-22 divisional playoff win over the Colts last week as New England ran the ball 46 times for 234 yards. Likewise, when these teams met back in November, Manning passed for just 150 yards and took a back seat to Denver running back Knowshon Moreno, who racked up 224 yards on 37 carries.
Will Brady and Manning, in perhaps the final chapter of their rivalry and with a Super Bowl berth on the line, play second fiddle to their respective running games?
2. Not bad for a rookie
Where the heck did this guy come from? That's a question just about everyone outside of New England asked themselves last week as they watched Patriots rookie linebacker Jamie Collins fly all over the field against the Colts.
The second-round pick out of Southern Mississippi wreaked havoc on the Indy offense, collecting six tackles, three quarterback hits, a sack and an interception. Thrust into a leading role after veteran Brandon Spikes was placed on injured reserve during the bye week, Collins had a breakout game in front of a national audience. But can he do it against the Broncos and the NFL's best offense?
Well, in truth, he already has. Collins recorded 10 tackles against Denver in New England's 34-31 win back in November. It had been his best performance as a professional before last week's playoff eye-opener.
But Collins faces a tough task today if he's matched up with Broncos tight end Julius Thomas, who didn't play in the teams' first meeting this season because of a knee injury. Collins was fantastic in coverage against Indianapolis, holding Colts tight end Coby Fleener in check and notching his first NFL interception, but covering the 6-foot-5 Thomas is no easy assignment. Including the playoffs, the Broncos tight end has caught 71 passes for 864 yards and 12 touchdowns this season while blossoming into one of Peyton Manning's go-to targets.
3. Let's be Blount
Watching the way the Patriots bludgeoned the Colts with the running game last week, it's hard to imagine this game hinging on anything other than the battle in the trenches and the running of LeGarrette Blount.
Blount steamrolled the Colts defense for 166 yards rushing and four touchdowns in the Patriots' divisional playoff victory, becoming just the second running back in NFL history to score four or more TDs in a postseason game. The former Tampa Bay Buccaneer has averaged 21 carries and 144 rushing yards in New England's last three games.
The Broncos defense has played the run well, allowing just 101.6 yards per game and 3.9 yards per carry during the regular season. Only once this season did an opposing running back rush for more than 100 yards against Denver, though the early leads often provided by the Broncos offense surely had something to do with that.
Denver's opponents, pressed to keep pace with Manning and Co., have run the ball 25 or fewer times in nine of 17 games this season. Only once did a Denver opponent approximate the 46 carries that the Patriots compiled last week, and that game -- a 27-20 Chargers win in which San Diego rushed 44 times -- didn't turn out well for the Broncos.
Watch SI.com analyst and former NFL quarterback Boomer Esiason explain why stopping the Patriots running game needs to be priority No. 1 for the Broncos:
NFC Championship Game: 49ers at Seahawks, 6:30 p.m. EST
1. The bruiser and the beast
The quarterback matchup between Seattle's Russell Wilson and San Francisco's Colin Kaepernick might be sexier, but running backs Marshawn Lynch and Frank Gore are the engines that drive these two offenses.
Lynch rushed for 1,257 yards and 12 touchdowns during the regular season, while Gore ran for 1,128 yards and nine scores. Lynch went all "Beast Mode" when Wilson and the Seattle passing attack struggled last week, piling up 140 yards rushing and a pair of TDs in a 23-15 divisional playoff win over New Orleans. Gore, meanwhile, pounded out 84 yards on the ground and averaged 4.9 yards per carry against a stout Carolina defense in the 49ers' 23-10 victory over the Panthers.
The 49ers and the Seahawks are throwbacks to the age of power running games and stalwart defenses. No two players embody that philosophy better than the human battering rams that are Gore and Lynch. They punish defenses, move the chains and open up the passing game for Kaepernick and Wilson. As these two go, so go the 49ers and the Seahawks.
When Seattle blew out San Francisco 29-3 in September, Lynch accounted for three touchdowns. When San Francisco evened the score with a 19-17 win over Seattle in December, Gore rushed for 110 yards on just 17 carries. The back who wins Round 3 tonight will put his team in the Super Bowl.
2. Defense to spare
The defenses in this game are so entertaining to watch that any offensive fireworks the 49ers and Seahawks muster will just be icing on the cake. It's too bad only one of these outstanding units will get the chance to play for a championship this year, but it sure is going to be fun to watch them try to out-nasty each other for a trip to the Super Bowl.
The 49ers will unleash the best linebacking corps in the game on the Seahawks offense. The 49ers' foursome of Patrick Willis, NaVorro Bowman, Ahmad Brooks and Aldon Smith just might be the most talented group the NFL has seen since Ricky Jackson, Sam Mills, Vaughn Johnson and Pat Swilling terrorized offenses for the Saints back in the late 1980s and early 90s.
Colin Kaepernick and the San Francisco passing attack faces the equally terrifying challenge of throwing into Seattle's vaunted "Legion of Boom." Led by NFL interception leader Richard Sherman and safeties Kam Chancellor and Earl Thomas, the Seahawks' secondary excels at intimidation and has made a habit of manhandling opposing receivers.
Defense wins championships? One of these teams will get the chance to prove that in the Super Bowl, but not until we see which one proves to be the best defense on the field tonight.
3. Familiarity breeds contempt
This one, as they say, is personal. Words will be exchanged, trash will be talked, tempers will flare. The mutual dislike between these NFC West rivals has gone from a polite simmer to a four-alarm inferno as the 49ers and Seahawks have risen to power in a neck-and-neck sprint the last two seasons.
Seattle and San Francisco have played four times in those two years and split those meetings. Both teams have successfully defended their home turf, with the Seahawks winning a pair of blowouts in Seattle and the Niners grinding out victories in two games by the bay. Along the way, the fire of rivalry was stoked.
"There is no love lost," Seattle's Richard Sherman said of the 49ers this week. "And there is no love found."
Maybe these teams are just too alike to breed anything but dislike. Both are led by a passionate head coach plucked from the college ranks, both hang their hat on defense and the running game, and both feature a dynamic young quarterback just scratching the surface of his potential. And now they have one more thing in common: Both are on the doorstep of the Super Bowl.
How fitting that the only thing standing in each team's way is the other. No matter who wins, the fire between these organizations will only grow hotter.
Watch SI.com's Boomer Esiason explain how the 49ers can break out of their CenturyLink Field funk and beat the "bully" Seahawks: