Flacco produced two scores in an abbreviated appearance, and the Ravens' defense held Carolina without a touchdown in a 17-12 preseason victory Thursday night.
Flacco went 8 for 12 for 120 yards and a TD. He guided Baltimore to a field goal in his first series, then went three-and-out before directing a 96-yard drive that ended with a 30-yard touchdown pass to Mark Clayton.
"We need to clean some things up, but overall it was a good start," Flacco said.
Backup Jimmy Clausen went 8 for 15 for 80 yards and an interception in his informal NFL debut. He was sacked twice.
"There were good things that happened and definitely some things I need to work on," the rookie said. "But overall it was good to get out there with bullets flying around for the first time."
Carolina turned the ball over on a fumble at the goal line by running back Tyrell Sutton that Baltimore recovered on its own 1.
"I thought offensively we killed ourselves a little bit with some penalties, the fumble down at the 1," coach John Fox said. "I thought we moved the ball efficiently. We hurt ourselves some, but we had a lot of young guys out there."
A torrential rain began in the third quarter, causing a sloppy game to become even messier.
Later in the quarter, Baltimore's Prince Miller broke seven tackles during a 57-yard punt return. That set up an 8-yard touchdown run by Troy Smith for a 17-9 lead.
Baltimore amassed 196 yards in offense in the first half, only 22 of them on the ground. Rice started but did not touch the ball.
"The offense looked pretty good," said running back Willis McGahee, who had four catches during the 96-yard drive. "I think we're where we want to be at this point in time, but we still have a lot of work to do. We need to do a better job blocking for the quarterback; still, we're all happy that we kept moving the ball down the field."
After a sack by safety Tom Zbikowski ended Carolina's opening series, Flacco completed a 23-yard pass to Derrick Mason on Baltimore's first play from scrimmage. The third-year quarterback then hit Clayton for 18 yards on third-and-10 to set up a 32-yard field goal by free agent pickup Shayne Graham.
"Mark was one-on-one on the edge," Flacco said. "I just had to give time to get on top of the guy, and he made an unbelievable play."
There was speculation Clayton's playing time this season would be squeezed by Boldin, Stallworth and Mason, but Clayton finished with a team-high 48 yards receiving.
"Mark played tonight like he has all camp, and he's had a good camp," Ravens offensive coordinator Cam Cameron said.
Stallworth and Boldin had one catch.
Copyright 2010 by The Associated Press