Fort Cherry won six games during the regular season and didn't get in the win column until April 15.
The Rangers (8-7) are one win from appearing in the WPIAL Class A championship game.
Fort Cherry, the 15th seed, plays Shenango (15-2) Thursday at Fairhaven Park in Kennedy Township at 2 p.m. The winner advances to the championship game against either Chartiers-Houston or South Side Beaver.
Fort Cherry has scored 22 runs through two rounds, knocking off No. 2 Sto-Rox in the first round and West Greene in the quarterfinals.