The Ravens also use a 3-4 defense, with Terrell Suggs joining Lewis at linebacker. Baltimore also has a ball-hawking group of defensive backs, including hard-hitting safeties Ed Reed and Bernard Pollard.
On special teams, it's been a up and down season for San Francisco placekicker David Akers. The usually reliable Akers enjoyed a stellar career with the Philadelphia Eagles before joining the 49ers before last season. However, an abdominal injury that required surgery has led to a subpar 2012 campaign for the former Pro Bowler, who made only 29 of 42 field goals this year. The Ravens, who fell short of the Super Bowl last year after kicker Billy Cundiff missed a short field goal in the AFC Championship Game, turned to rookie Justin Tucker to handle placekicking duties this season. All he's done is make 30 out of 33 field goal attempts in 2012.