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Jon Ritchie

Tweaking the Ravens Part II: The defense

Tweaking the Ravens Part II: The defense

This is the second installment of a three-part series in which Baltimore Sun reporter Matt Vensel examines the Ravens and how each area of the team can be improved this offseason. He will look at the Ravens' special teams unit in Saturday's paper.

The Ravens' defense was the team's best unit in 2011, ranking among the NFL's elite in sacks, scoring defense and yards allowed per game.

But you could argue that the defense has the most question marks entering this offseason.

Defensive coordinator Chuck Pagano left to become coach of the Indianapolis Colts. The Ravens have a handful of key free agents on defense — starting...