Harford Tech senior co-captain Jalen Dangerfield scored all 20 of his points in the second half as the Cobras overcame a 19-point second-half deficit and rallied for a 64-60 victory at Catonsville (0-6).
Senior co-captain Laday Cooper scored 14 and Antawan Corprew, TJ Lowery and Enoch Wiredu had eight each for the winners.
Catonsville was led by KJ Spruill (17 points), Dashawn Dixon (14) and Caleb Owens (12).
When Tiree Holmes assisted Dixon for a layup, the Comets led 37-18 with 6:10 remaining in the third quarter.
Harford Tech went on a 13-2 scoring surge that was ignited by the defense and they cut the lead to eight, 39-31.