Carson Finney caught two touchdown passes and intercepted three others and Brett Tutter rushed for 153 yards and three scores to lead Brock (8-4), which won its eighth straight game after an 0-4 start.
With both clubs trading two early touchdowns apiece in the first nine minutes of play and Brock clinging to a 15-13 lead, the Eagles blew the game open with 35 unanswered points and were never threatened beyond that point. The Eagles now advance to face the winner of Bushland (11-0) and Jim Ned (8-3) in the Region I-3A quarterfinals.
Muleshoe (8-4) was led by Nathan Martens, who threw for 132 yards and two scores.