Other Northlanders in the 18-strong team to put on strong performances at the Auckland event were Abbie Palmer and Jacinta Matson.
Palmer, who is a member of the New Zealand junior girls squad which will head to Poland to compete later this year, was beaten in the semi-finals by the eventual winner of the girls open division, Rebecca Barnett. Palmer went on to take out third in the girls open division.
Matson, who is also in the national junior girls' squad competing in Poland, won the plate in the girls open division.
Both Palmer and Matson's form is timely as the Poland squad is set be trimmed in around a month's time.
Northland had four boys in the open division with Max Trimble, Finn's older brother, and Reagan Wakeling coming up against each other as they vied for the chance to compete for the special plate.
Max came out on top in the hard-fought four-setter, going on to then be knocked out in the semi-finals for the special plate.
There were 197 entries from all over New Zealand competing at the NZ Junior Open, including eight girls and 10 boys from Northland.
RESULTS
Boys' Division 1: Winner: Finn Trimble.
Boys' Division 2: Winner: Nathan Chestnut; Third: Sam Dykzeul.
Boys' Division 3: Runner-up plate: Jacob Browne; Classic Plate: Shayden Toka; Runner-up Classic Plate: Bradley Vuletich.
Girls' Open Division: Third: Abbie Palmer; Plate: Jacinta Matson.
Girls' Division 2: Fourth: Zoe Dykzeul; Runner-up Plate: Olivia Brookland.
Girls' Division 3: Fourth: Gemma Turketo; Plate: Paige Browne.