The Mariners finished on top of the under-15 ladder and were clinical in their win against Fremantle in the final in South Perth.
After losing the toss, the Mariners were sent into the field and struck early.
Aaron Burrage (3-20 off 12 overs) and Matt Edwards (2-5 off 8 overs) were superb and well supported by Rory Dennis (1-10) and Jai McCamley (1-10).
A run-out finished Fremantle’s innings, all out for 93.
Mariners openers Jordan Brokate and Trent Goodrick faced a difficult first five overs before lunch but survived with no loss of wickets.
Soon after lunch Goodrick was dismissed, bringing inform Burrage to the crease, who lifted the scoring tempo and put on a partnership of 55 with Brokate to get the team to a match-winning position.
Burrage went for 34 before Levi Muller (12n.o.) and Brokate (38n.o.) reached the winning total.
It was the under-15s’ first premiership since 2000/01.
The club also hosted its senior wind-up at the weekend, with First Grade’s Craig Simmons dominating the awards, winning the first-grade batting, bowling and all-rounder trophies and MVP award.
Simmons also won the WACA Olley Cooley Medal last week.