2012 Super Bowl Champion and former NFL center, Matt Birk, joins Markus "The Waterboy" Boucher to dive into the history of the Ravens versus 49ers ahead of their Christmas day matchup.

<p>2012 Super Bowl Champion and former NFL center, Matt Birk, joins Markus "The Waterboy" Boucher to dive into the history of the Ravens versus 49ers ahead of their Christmas day matchup.</p>

Every weekday morning, KNBR listeners join Brian Murphy and Markus Boucher from 6am-10am only on KNBR!

<p>Every weekday morning, KNBR listeners join Brian Murphy and Markus Boucher from 6am-10am only on KNBR!</p>

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