McCallie erupted for double digit runs against Pope John Paul II in a deciding game of a three-game set on Saturday in Nashville, winning 14-0.
The Blue Tornado advance to a meeting with Montgomery Bell Academy next week with the winner going to the state final four.
Daalen Adderley held Pope John Paul II scoreless in the one-sided victory.
On Friday, McCallie lost the opener 11-0, then came back to win 5-1.
Saturday's game was scoreless until the fifth when Max Riemer drove a ball to the right center gap to bring in two runs. Another run scored in the inning to put McCallie up 3-0.
In the sixth, Adderley doubled in a run. Another run scored on a passed ball. With the bases loaded, Kahler Youngblood was hit in the back by a pitch, forcing in the sixth run for McCallie. The Blue Tornado scored twice more to lead 8-0 at the end of the sixth.
McCallie scored six more runs in the seventh for plenty of insurance.
Adderley yielded only two hits and the defense played errorless ball.
Also, Chattanooga Christian won its playoff game at St. George's, 9-4.
The Chargers scored the first five runs of the game, then St. George's scored one in the third and two more in the fourth. However, CCS had a big sixth inning to pull away.
Amos Davenport had three hits, and John Rhodes and Nathaniel Kapp two each.
Kapp had three RBIs and was also the winning pitcher.