Pro Bowl outside linebackers Terrell Suggs and Elvis Dumervil entered Sunday with a combined 17 sacks, but were stonewalled by the Bears' offensive line.
They combined for just one tackle and no sacks.
"They were chipping the edges quite a bit," Ravens coach John Harbaugh said. "That had a lot to do with it. It was a tough pass rush day as far as the field conditions. But they were chipping the edges for the most part all day, then getting guys out."
Dumervil also was flagged for unnecessary roughness when he shoved Bears quarterback Josh McCown to the ground in the fourth quarter.
"They're supposed to give you a step-and-a-half," said Dumervil, who had three sacks the previous game against the Cincinnati Bengals. "I was definitely within the step. I thought that was a weak call."
Harbaugh mum on injuries
Harbaugh provided no injury updates Monday other than saying there were no serious injuries Sunday.
"We'll have our injury report on Wednesday, but we look pretty good there," Harbaugh said.
Pro Bowl nose tackle Haloti Ngata missed the game with a left knee injury.
When asked if Ngata didn't play because of the weather, Harbaugh declined to elaborate on the reasons for his inactive status.
"I'm not getting into all that," Harbaugh said. "There's no reason for us to put that out there publicly. What advantage would there be for us to comment on that? It wouldn't help us, but I appreciate you asking."
Terrence Cody started in place of Ngata and had one tackle.
"We hope Haloti's back soon," Cody said. "If he's not, I got to carry the load."
Rookie wide receiver Marlon Brown missed the game with a knee injury, but said he'll be back Sunday against the New York Jets.
"I'll be fine this week," he said. "It's just bruised. I'll be good."
Harbaugh defends Yanda
Throughout the season, offensive guard Marshal Yanda has moved around to signal to his teammates before the snap.
The NFL allows offensive linemen to do so as long as it's not disruptive to the defense and is regularly utilized.
Yanda was flagged for a false start Sunday, though. And Bears coach Marc Trestman said Monday that he's going to submit examples of Yanda's pre-snap movements that he claimed led to Bears offside penalties.
However, Harbaugh said Yanda is operating within the rules.
"My take is that's what Marshal has been doing exactly all year," Harbaugh said. "What they tell you is as long as it's consistent all year that's the way it is. You have to have the mechanism to snap the ball with crowd noise. It's a silent mechanism.
"The fact that they Bears don't choose to use that one, they have other ways to do it. They do it with their center. Their center is nodding his head all over the place. So, we're not going to send that in. But the one that Marshal got called for was the same thing he had been doing the whole game."
Wide receiver Tandon Doss was unable to secure two accurate Flacco passes Sunday.
In the fourth quarter, Doss dropped a short pass on third down. In overtime on third down, Doss couldn't bring in a pass over the middle that led to a punt with the Bears winning the game on the ensuing possession. Flacco later said he thought Doss might have been interfered with in overtime.
"I couldn't make the catch at the end to keep things going," Doss said. "We've got to figure out what we need to do to start getting some wins because we've got a long season ahead."
Reserve cornerback Asa Jackson played in a regular-season game for the first time since his rookie season after completing his eight-game suspension for violating the NFL performance-enhancing drug policy, lining up on the punt return and kickoff teams. "It's an opportunity I've been waiting for since August," Jackson said. "I was happy to get out there." … During the nearly two-hour delay and tornado watch Sunday, Harbaugh walked up the tunnel at one point to check out the field. "It almost seemed like a tornado came up the tunnel," he said. "They grabbed me to get out of the tunnel, the security guys. They screamed at me. It didn't take much to get me back up the tunnel."