The Mariners are back on the winners list after a comprehensive eight-wicket win over Wanneroo.
Winning the toss and batting first Wanneroo failed to face out their 50 overs rolled for 152 with 24-balls remaining in the innings.
Leon Coombs and skipper Aaron Burrage claimed two wickets each early before Damien Burrage run through the tail taking four wickets.
Captain Burrage and Teague Wyllie got the Mariners off the a great start putting on 66 for the first wicket before Burrage fell for 38.
Callum Austen was run out a short time later for just one but between Wyllie (72) and Corey Wasley (43) they saw the visitors home chasing the runs with more than 13 overs to spare.
Rockingham-Mandurah take on Perth at Fletcher Park in the last round of the one day competition hoping for a victory and results to go their way to make the semi-finals.
The two day competition resumes on January 30 with four rounds remaining the Mariners sitting in second place on the ladder.