The Buckeyes won 11-5, captured third place behind Carthage and Spring Hill, and will play bi-district on May 4.
They travel to Paris Friday for a 7:30 p. m. game before returning home Saturday to play at 2 p. m. If needed, a third game will follow 30 minutes after.
The shot over the wall by Hollis Friday gave Gilmer a 5-0 lead and Luke Turner would increase it to 6-0 on Blevin Burns single to left center.
Hollis would finish the night going 2-for-4 with a double and a homer and five RBIs.
In the second inning, Gilmer had forced in Brice Rawls when starting pitcher Shawn Albright hit Dylan Bowman with a pitch, his fourth walk of the inning.
Rawls was running for Jaidon Parrish.
Brady Tomlin and Travis Carter also walked to load the bases.
Hollis worked the count to 3-1 before he found the pitch he could hit.
After the homer, Pittsburg called on Brandon Colbert to pitch and he gave up the winning run to Burns.
Jordan Traylor added a run in the fourth to increase the lead to 7-3.
Bowman, Hollis, Traylor, and Burns all scored in the sixth to give Gilmer an 11-3 advantage.
Pitt came back with two runs in the seventh, but not enough for the win.