Northend's pitching woes continued through the sixth when Amidon walked Sean Kramer and hit La before being replaced by Daniel Paramo.
Paramo fared no better as he walked Tyson to load the bases and then gave up a two-run double to Potter that would score Kramer and La for an 8-3 lead.
Brusokas, Joshua Gonzalez, and Jeremy Camacho all reached base on errors.
Potter scored on an error. Taylor Matherly hit a fielder's choice that scored Brusokas and Chris Ziegler blasted a three-run double that nearly cleared the fence to put La Crescenta up by 10.
Kramer flied out to end Northend's miserable half-inning.
In the bottom of the inning Amidon singled and was awarded second on a Ziegler balk.
Nick Swing got on via an error and Amidon scored to end the chance of a 10-run rule ending the game at the end of the inning.
Paramo and Leo Ibarra both walked to load the bases and Swing was driven in by Johnny Vista, who reached first on a fielders choice.
Paramo and Vista both scored on errors and Northend managed to leave the inning trailing only 13-7.
In the seventh, La Crescenta extended its lead when Brusokas sent in La with a ground-out and Jeremy Camacho drove in Tyson with a single.
In the bottom of the inning, Tyson came in to close and struck out Swing and Ibarra after Amidon flied out.
La Crescenta advances to the tournament's final round Wednesday.
"I'm proud of my players. I'm really hoping we'll be ready," said La Crescenta coach Gilbert Camacho, adding he is worried his players might be a little tired after Monday's game.
"(Northend) is a good team and I enjoyed playing against them," Camacho said.
The loss sends Northend to the consolation game versus West Torrance. Northend, made up of players from Brawley and Calipatria, must win to advance to the final and face La Crescenta again.
"We'll just put it behind us," Northend coach Julio Baeza said of the loss. "We're still a good team and we know it."
Baeza said his team needs to eliminate the crucial errors that it committed and "pay attention more and concentrate."
Baeza is optimistic about today's game.
"We're going to stop them on the mound," Baeza said. "Our defense is going to help out."
Northend faces West Torrance at 7 tonight at Stark Field in El Centro.