Nashua finished the season with a successful second half.
The Silver Knights lost both ends of their wild doubleheader on Thursday to eliminate them from playoff contention.
Noah Wachter allowed one run while Jackson Linn and John Mead homered.
Nick Guarino pitched a complete-game shutout as Nashua snaps a four-game losing streak.
With a 7-1 win, the Lake Monsters have now won 40 games this season, setting a new FCBL record.
Aidan Crowley also pitched 5.2 innings of one-run ball.
Jack Beauchesne pitched four strong innings in his final start of the season.
The second-longest winning streak in franchise history came to an end on Thursday with a 9-5 loss.
Nashua is now in sixth place and only four games back of a playoff berth.
Ten walks and only four strikeouts helped Nashua continue its best stretch of the season.
Powered by Sam McNulty's mammoth day, Nashua swept its doubleheader against Westfield.