OWINGS MILLS, Md. -- There should be a fantasy football alert: Play the quarterback facing the Baltimore Ravens that week.

This is the type of embarrassing label that gets put on a defense that has allowed three quarterbacks in the last four weeks to set single-game career highs in passing yards. Oakland's Derek Carr threw for 351 yards. Cincinnati's Andy Dalton went for 383 yards. And Cleveland's Josh McCown put up 457 yards.

Next up, San Francisco's Colin Kaepernick. For the record, his career best is 412 yards passing.

"As a passer, I think the guy has a cannon for an arm," Ravens defensive coordinator Dean Pees said. "I think he can stick it in there in a tight window. I’ve seen him throw it a long ways and be very accurate on it. I think the times that he hasn’t been [accurate] is when he has had pressure, and he has had to move around a lot in the pocket. Any quarterback is going to have a tough time if you can’t set your feet and throw the ball."

The Ravens have never allowed over 400 yards passing in back-to-back games, but this hasn't been the traditionally strong Baltimore defense. Linebacker Terrell Suggs has been out of the lineup from Week 2 on, and in that time only the 49ers have given up more passing yards per game than the Ravens (310.3), according to ESPN Stats & Information.

Baltimore, though, has seemed more concerned about Kaepernick's legs than his arm. Kaepernick leads all quarterbacks this season with 218 yards rushing, and his 6.1 yards per rush is tops among quarterbacks with at least 15 attempts.

"Pass rush becomes run defense to an extent," coach John Harbaugh said. "You have to have a gap-control understanding, you have to keep the player inside and in front [and] you have to get off blocks. You can’t get hung up on blocks. You can’t let them hold you and pull you back; where you’re bull-rushing and they pull you back and the quarterback runs right by you. Those are considerations that we have to be aware of and make sure we defend him as a runner.”

If Kaepernick has success throwing the ball, it'll be another hit to the Ravens' reputation. He's struggled so much this season that some were calling for the 49ers to bench him. Kaepernick ranks 23rd in the NFL in passing yards (989) and 32nd in passer rating (76.8). He did bounce back last week against the New York Giants, throwing for 262 yards and two touchdowns.

"Kaepernick remains the same," Harbaugh said. "They’re trying to find what he does well with the guys around him now, and they’re starting to find their way that way a little bit."

The Ravens want to make Kaepernick as uncomfortable as possible, and that could be a challenge if they're without their top two pass-rushers, Suggs (season-ending Achilles injury) and Elvis Dumervil (hasn't practiced this week with a groin injury). Last Sunday, after losing Dumervil in the first half, the Ravens blitzed 42 percent of the time (14 of 33 dropbacks).

Getting to Kaepernick will be one of the biggest keys to the game. He has been pressured on 35.1 percent this dropbacks, the third-highest rate in the NFL, according to ESPN Stats & Information.

“The biggest thing is pushing the pocket and caging him," Ravens nose tackle Brandon Williams said. "Don’t let him become a running back; just let him be a quarterback. That’s one of the biggest things we have to do – stay in our rush lanes and make him be mobile in the pocket and nowhere else.”