The GCA Cougars (15-12-1) rode the arm of pitcher Trey Harney who gave up only one hit and struck out 12 North Decatur batters in five innings in the 10-0 seven inning game.
CGA backed Harney and relief pitcher Jacob Potter with a 12-hit attack.
The Cougars led only 2-0 after five innings but exploded for three runs in the sixth and five more in the seventh. Potter had three hits while teammates Charlie Overton, Eli Ellis and Cole Muhlhauser had two hits apiece.
GCA meets Class A No. 1 Barr-Reeve (27-3) Saturday at 2 p.m. in the Jasper Semistate. The winner plays the Shakamak-Rising Sun winner at 8 p.m.
Center Grove (27-3) edged Columbus North, 4-2 Saturday at Jasper. The Trojans now face Brownsburg at 2 p.m. in the Plainfield Semistate with New Palestine against Castle at 11 a.m. The winners meet at 8 p.m.
The Trojans pushed across single runs in the first, third, fourth and sixth innings. Senior Garrison Barile had two doubles and drove in two runs and junior Noah Coy had two hits and an RBI to lead CG’s 10-hit attack.
Senior pitcher Jacob Murphy pitched six innings and gave up two runs on three hits. Classmate Caden Cornet came in for the seventh inning and the save.