First, Craig McIlvaine (160 pounds) pinned Andy Mann in 3:20 to give defending 3A-4A dual-meet state champ Frederick an insurmountable 36-9 lead over No. 8 South Carroll with three bouts left.
Then the visiting Cadets (10-0) surprised some by forfeiting the remaining three weight classes for a 36-27 victory.
South Carroll (11-2) trailed, 30-3, after the Cadets' third-ranked two-time state champ Tim Novak (140, 19-0) scored a 9-3 decision over Kevin Sakalas and a first-period pin by John Harper (145, 21-0).
"I didn't think we had a shot when I got up because there were a few matches we should have won that went the other way," said the Cavaliers' Charlie Conaway (152, 20-2), who scored a 20-second pin before McIlvaine (19-5) sewed up the match.
"Our lightweights had taken a beating in our most recent match against Quince Orchard [a 26-24] win, but tonight, they really came through," said Frederick's first-year coach Andre Jackson, whose Cadets are ranked ninth by the Maryland State Wrestling Association.
"There were a couple of surprises, but for the most part, after an intense week of practice, everyone made up for it."
South Carroll, ranked No. 8 in the area, was coming off last week's 37-31 victory over No. 3 Francis Scott Key, which last night beat No. 7 North Carroll, 38-27.
North Carroll, the defending 1A-2A dual-meet state champ and an earlier 33-24 loser to Frederick, earlier won, 31-29, over South Carroll.
Frederick led, 18-0, after four bouts, including pins by Kevin Ferraro (112) and Christian Davis (119).
First, however, the Cadets' Dusty Bane (103, 18-4) broke a 2-2 tie with a 7-0 run in a 9-2 decision over Tim Hymiller. And at 125, Lonnie Bane (16-5) consistently countered the Cavaliers' Dan Alberter en route to winning, 7-3.
It was 18-3 after South Carroll's Dan Peiffer got a 10-7 win over Bo Harper, but, 21-3, after the Cavaliers' Justin Webber (135) blew a 2-0 lead and succumbed, 8-3, to Shane Hildebrand.
South Carroll coach Pete Olson, who had hoped to set up his upper weights as he did in last week's win over Francis Scott Key, said, "I knew it was academic when we lost at 125 and 135.
"Losing those matches, and the fact that we gave up too many pins, that's what hurt us." Frederick's really tough down there, and they're a very good team overall."
The forfeits prevented South Carroll's sixth-ranked defending 3A-4A state champ Mike Chenoweth (171, 19-1) from going after his 15th pin.