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Super Bowl XLVIII is all about contrasts.
The Broncos are defined by their prolific offense, while defense sets the tone for the Seahawks.
Seattle led the NFL in a litany of defensive categories, including total defense, passing defense and scoring defense. Its vaunted "Legion of Boom" secondary is the NFL's best.
Just ask them.
It will take an even better effort than Seattle's stellar defensive showing against San Francisco to knock off Manning and the Broncos in Super Bowl XLVIII.
Here are three keys to an upset for the Seahawks:
The Best Defense is a Good Offense
As great as the Seattle defense is, their best defense against Manning and the Broncos might actually be their offense.
Getting into a shootout with the most potent scoring offense in NFL history probably isn't a good idea, but a blueprint exists for downing the Broncos that the Seahawks should closely examine.
The last time Denver lost, to the San Diego Chargers in Week 15, the Chargers pounded the ball on the ground, handing the ball off 29 times to Ryan Mathews. San Diego rushed 44 times in total, while QB Philip Rivers attempted only 20 passes.
The Seahawks have a bruising back in Marshawn Lynch, and Seattle absolutely must establish the run game at The Meadowlands.
Simply put, the Broncos can't score if they don't have the ball.
It worked for the New York Giants in the Super Bowl against Jim Kelly's "K-Gun" Buffalo Bills. It also worked for the Patriots against "The Greatest Show on Turf" St. Louis Rams.
It can work for Seattle against Denver.
Russell Wilson Must Step Up
Even if the Seattle defense plays well and the Seahawks get the ground game going, Manning and the Denver offense are going to get theirs sooner or later.
At some point in Super Bowl XLVIII, Russell Wilson is going to have to make a big play, be it a scramble to keep a drive alive or an all-important third-down completion.
In that regard, there's some cause for concern. Wilson's passer rating and completion percentage are both way down in the playoffs as opposed to the regular season, and the second-year pro has only a single touchdown pass in two playoff games this year.
Granted, Wilson has played well enough to get the win in those games, but they were in Seattle.
This game isn't, and Wilson needs to shake off his late-season funk if the 'Hawks are to lift the Lombardi Trophy.
Make Peyton Manning Uncomfortable
We'll close with the single most imperative key to victory for the Seahawks. Unfortunately, it may also be the most difficult to pull off.
The Broncos possess one of the best offensive lines in the NFL. Football Outsiders ranks the group tops overall in the league in pass protection.
Of course, if you flip that, the Seahawks' defensive front ranks a very respectable seventh in the NFL in pass rushing. The team finished fifth in the NFC with 44 sacks, and while Seattle doesn't possess a dominant pass-rusher, the team does have several very capable ones.
Avail yourself of that depth. Come at Manning not only with defensive ends Cliff Avril and Chris Clemons, but also with plenty of blitzes.
Yes, it means more man coverage, but if there's a team in the NFL with a secondary up to the task, it's the Seahawks.
The alternative is giving Manning all day to throw the ball. The Patriots, who had more sacks in 2013 than Seattle, were unable to get any sort of pressure in the AFC title game.
Manning carved them up to the tune of 400 yards, two touchdowns and a passer rating of nearly 120.