Freeport appeared to have the game in hand late in the third quarter. Maurice Irby's nine-yard touchdown run had given the Red Devils a seemingly comfortable 20-point lead.
But Kevin Monahan threw a pair of touchdown passes (eight and six yards) to cut MacArthur's deficit to six late in the fourth quarter. The Freeport defense, however, would hold on for the crucial Nassau Conference I victory, 41-35.
"We got sloppy and didn't take care of the football," Freeport coach Russ Cellan said. "In all honesty, I thought we had the game in hand. But they didn't quit."
Down 14-7 in the second quarter, Tom Joyce had an 89-yard touchdown run to even the score early in the second quarter for MacArthur (4-3).
Freeport (6-1) pulled ahead in the third quarter, as quarterback Isaiah Barnes ran for scores of five and two yards to build a two-possession cushion. Barnes went 5-of-7 for 78 yards and three touchdowns on the ground.
Dan Oliver paced the ground attack with a team-high 189 yards on 15 carries. But for a squad that has scored 41 points in each of their past four games, offense is not the problem.
"We need to be more consistent defensively," Cellan said. "There are some weeks we play great, and weeks like this where we are just inconsistent."
An inconsistent effort won't be good enough on Saturday, when Freeport hosts undefeated Oceanside (7-0) in the regular-season finale.
"It's a big game," Cellan said. "It is certainly the biggest game Oceanside has played in quite some time."