Fallston dominated visiting Hereford but had to hang on for a 1-0, first-round victory in Class 1A-2A North action last night.
Sophomore Beth Blasi scored the Fallston goal early in the second half.
The victory sends the Cougars (10-3) against North Harford in the regional final on Saturday.
North Harford defeated Overlea, 2-1, in last night's other opening-round match.
Fallston spent much of the game in the Hereford end, taking 34 shots.
Hereford's freshman goalkeeper Kate McFarlane, a product of theOlympic Development program, finished with 14 saves.
At the other end, Hereford managed only three shots against junior goalkeeper Suzy Harrison.
Despite the dominance, Fallston did not play nearly as well as it had last week in a 3-2 double-overtime loss to rival C. Milton Wright in a game that decided the Harford County championship.
"We just weren't fired up -- no intensity," said Fallston coach Nancy Ferguson.
"Our game is controlling those 50-50 situations, but we stood around a lot. We had the chances, but we did not finish them off," Ferguson said.
McFarlane, one of four freshmen in coach Steve Power's starting lineup, also is one of the Bulls' leading scorers. She is one of four players with seven goals, and has three assists.
"Even with that, there is no way she was going to be anywhere but in the box," Power said.
Hereford (8-5) also came up short in its county championship game, losing the Baltimore County title to Loch Raven.
The Bulls were 8-1 in the county, but could not handle stronger non-league opposition.
"We knew coming in we'd be outmanned," Power said. "Under the circumstances, I thought we did a good job.
"We got a strong effort from Tara Troup, our stopper, and as our only starting senior, she gave us outstanding leadership."