Super Bowl 2013: Defensive X-Factors Who Will Decide Outcome of Harbaugh Bowl

The NFL has evolved into an offensive league, but it is defense that has decided the fate of the Baltimore Ravens and San Francisco 49ers in the playoffs this year.

Both the Ravens and 49ers feature impressive defensive units that have played phenomenal football this postseason, led by some of the best players in the league. Veterans like Ray Lewis and Ed Reed are motivated by what may be their chance at a Super Bowl ring, while Patrick Willis and Aldon Smith are out to prove they are the new ...

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