No. 2 Southern Lehigh overcame a 7-1 deficit to earn a 9-8 win over No. 3 Bangor on Monday in the District 11 5A semifinals at Lehigh's Goodman Campus.
The Spartans will face either Blue Mountain or Whitehall in the championship game on Wednesday.
Those teams will meet in the other semifinal on Tuesday.
In the 4A bracket, No. 1 Notre Dame was upset by No. 5 Pine Grove 6-0 in one semifinal.
No. 2 Wilson beat No. 3 ACCHS in the other semifinal.
Wilson will meet Pine Grove for the championship on Wednesday.