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If there's a weakness in the Steelers defense, it's definitely in the secondary. Troy Polamalu is a stud and leads the league in interceptions, but neither Ike Taylor nor McFadden are shutdown corners.
The Ravens have a ton of weapons on offense, between Anquan Boldin (837 yards, seven touchdowns), Derrick Mason (802 yards, seven touchdowns), Todd Heap (599 yards, five touchdowns), T.J. Houshmandzadeh (398 yards, three touchdowns) and Ray Rice (556 yards, one touchdown). Joe Flacco is one of the better quarterbacks in the league and he threw for 256 and 266 yards in Baltimore's two games against Pittsburgh during the regular season.
McFadden was a non-factor in those two games, recording three and four tackles. He's had a decent season with 81 tackles, 10 passes defended and two interceptions, but he's not good enough to cover either Boldin or Mason without help. One big play by McFadden on Saturday could set the tone for the rest of the game and keep the Ravens offense conservative.