At Waterville, Brian Bellows allowed only four hits and struck out four to help fourth-ranked Waterville shut out No. 8 Mount Desert Island.
Waterville advanced to Tuesday’s 3 p.m. Eastern Maine Class B final against No. 2 Winslow at Mansfield Stadium in Bangor.
Bellows also drove in the game’s only run in the seventh inning when his slow roller to first plated Alan Wood from third.
Ben Walls turned in a strong pitching effort for MDI as he only gave up four hits.
Waterville improved to 16-3 while MDI finished at 11-8.