Rockingham-Mandurah skipper Aaron Burrage had led his side to a five wicket win over Wanneroo.
Burrage claimed two wickets with the ball to bowl Wanneroo out for 173 and the beginning of the final over of the innings.
Damien Burrage also captured two wickets while Ashley Blake, Craig Simmons, Aaron France and Mitchell Oliver all chipped in with a wicket each in an all round team bowling performance.
The Mariners set off on the chase with skipper Burrage belting a quick fire 47 from 48 balls in an 87-run opening stand with Tyler Robertson (49).
Craig Simmons finished the game off with an unbeaten 19 while Damien Burrage was amongst the runs finishing 26 not out as the home side reached the target in the 41st over.