A five-wicket haul from Craig Simmons buoyed Rockingham-Mandurah to a second consecutive victory as they toppled Willetton at Burrendah Park on Saturday.
Simmons finished the day on 5/56 after an efficient 23 overs, a spell that included eight maidens as he led the charge for his bowling attack to dismiss the Dragons on 196, well short of their required 245.
Rockingham-Mandurah set the target on the back of a strong batting performance on day one last weekend, with Tom Lammonby (71 off 159) the catalyst.
Opener Tyler Robertson (54) and the in-form Aaron Burrage (38) also chimed in with strong contributions as they led the team to 244 after 86.2 overs.
Willetton's chase appeared off to a steady start when Ellis Cassidy and Iszak Milentis set out to find a rhythm early, but the former's dismissal on 21 runs put a speed bump in the road.
From there Milentis (40) continued to give the Dragons steady runs, while Shayne Wornes gave a team-high 51.
But a collapse came about when Simmons heated up, with Willetton slipping from 3/106 to 6/167 in a hurry, and things only got worse for the home side when the loss of Wornes left them at 7/171.
In the end it was light work for Rockingham-Mandurah to collect the remaining wickets, dismissing their foes in just a click more than 70 overs.
The win moves the Mariners up to 10th on the first grade ladder, one spot above Willetton, with their season back on track after an 0-3 start.