Rockingham-Mandurah have been skittled for just 81 in their one day clash against Mount Lawley.
After being sent in by the home side the Mariners innings was wrapped up in just 28-overs.
Mitchell Zadow (23) top scored while only three other batters made double figures Aaron Burrage (18), Damien Burrage (15) and Jaxon Cornford (12).
Mount Lawley brought the total up two wickets down in the 18th over.
Ash Blake and Mitch Oliver captured a breakthrough each.