The offensive line’s run-blocking should improve with the addition of free-agent center Matt Birk and return of RG Marshal Yanda from injury. The Ravens drafted RT Michael Oher in the first round to fill the gap left by the retirement of Willie Anderson.  

Depth is a major issue since Chris Chester is the only backup center who has any experience. In his three years in the NFL, Chester has played in 43 games. He started 11 games for the Ravens in 2008.

The Ravens tried to get better at pass protection, an area in which they ranked 18th ...

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