Video: Greg Roman Discusses Challenges of 49ers Top Defense

Ravens favored by 5
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Ravens offensive coordinator Greg Roman says the 49ers pose a tough challenge Week 13 at M&T Banks Stadium. San Francisco has the league's No. 1 overall defense, allowing 248 yards per game, and also lead the NFL with 44 sacks. Arik Armstead sets the tone the way with 10 sacks, followed by Nick Bosa (eight sacks) and Dee Ford (6.5 sacks).