"We're playing really well," said the Explorers' Sean Coleman, who scored two goals. "Our defense has just been shut-down completely. They're playing lights out."
The top-seeded Explorers from District 12 have been dominant in postseason play. They've won their three games by a combined score of 33-9 and have scored 27 goals in their last two games.
"That's what we're here to do," said Matt Rambo, who scored a game-high five goals. "It's business, now. It's not just a game."
La Salle last lost April 15 against Gilman School (Md.).
Sean Coleman scored just nine seconds into the game, and Rambo scored three goals before halftime as La Salle built a 9-0 lead on North Allegheny (17-6), the top seed from District 7.
North Allegheny's only goal came with 1 minute, 20 seconds left in the half.
Brian McNamara and Aidan Kerrigan each scored twice for La Salle.
"That's kind of our thing this year. We've been jumping on teams early," Rambo said. "Today, we were just trying to roll on them and move the ball on offense and try not to be selfish."
La Salle last won a state title in 2009.
North Allegheny 0 1 0 0 – 1
La Salle 4 5 3 2 – 14
Goals: NA-Grant Page. LS-Sean Coleman 2, Matt Rambo 5, Steve Hudak, Zach Drake, Brian McNamara 2, Mitch Soufleris, Aidan Kerrigan 2.
Saves: NA-John Brandon 10; LS-Nick Hreshko 3, Colin MacDougall 3, Conor Scafidi 1.
Contact Tim McManus at firstname.lastname@example.org. Follow on Twitter @ByTimMcManus.