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Few quarterbacks can claim the kind of postseason run Flacco is currently on. Three wins, eight touchdowns, zero interceptions and back-to-back road takedowns of Peyton Manning and Tom Brady bring Flacco's 2013 playoffs within one step short of immortality.
However, that last step will likely be the most difficult of the bunch.
The 49ers possess a defense that the Ravens have yet to see in these playoffs—one that can consistently win at the line of scrimmage, get pressure with four or less players and sit back in coverage. It's a physical defense that features top players at every level.
The 49ers' formula is trouble for any quarterback, and Flacco has been especially awful against defenses that have pulled off the blueprint. Road games at Kansas City (Flacco: 187 yards, one interception) and Houston (147 yards, two INT) come to mind.
Momentum is a difficult thing to gauge from game to game, but it's clear that Flacco has some on his side. However, momentum won't mean much for Flacco on Sunday if the 49ers are whipping the Ravens at the line of scrimmage and sending seven or eight players into coverage.
Flacco needs to have his most impressive performance of these playoffs for the Ravens to win.