Brian Shifflett and Brian Doyle both walked to start the sixth-inning rally for Clear Spring (5-4, 3-4). John Mason singled to center to load the bases for Thurber.
No. 7 Boonsboro (8-4, 6-2) trailed 8-6 before scoring five runs in the top of the sixth to take an 11-8 lead.
Matt Fortese started the rally with a one-out double to left and scored on a double to center by Cody Poffenberger. After Jeremiah Mills walked, Kyle Kane singled to center to drive in Poffenberger. Cam Shifler followed with a single, and an outfield error enabled both Mills and Kane to score on the play as Shifler reached third. Shifler came home on a wild pitch for the final run.
"You can't take anyone lightly," Boonsboro coach Max Shaffer said. "You have to come ready to play. Every time we play these guys, they always hit the ball well. They deserve to win."
Winning pitcher Scott Keeney and Andrew Blickenstaff had three hits each for Clear Spring.
Shifflet drove in two runs and scored two. Aaron Mills and Thurber added two hits each for the Blazers.
Clear Spring jumped out to a 5-0 lead in the first two innings, but Kane capped a four-run rally in the third with a three-run homer - his third in the last two games - to help the Warriors cut the lead to 5-4.
Kane finished with four RBI, three runs scored and three hits, while Fortese also had three hits for Boonsboro. Tim Cole, Jared Ferguson and Poffenberger had two hits each.
