Craig Simmons has belted 176 to lead Rockingham-Mandurah to a commanding total at Lark Hill.
After winning the toss and batting first against Joondalup on the first day of their two day clash the Mariners were in all sorts of trouble at 7/73.
Simmons and Tyler Robertson (66) then combined for a record breaking eighth wicket partnership of 230 to boost the total to all out for 345.
The record for the highest eight wicket partnership in first grade for the Mariners was 113 while the highest eighth wicket partnership for the club was 145.
Joondalup will set chase of the target next Saturday.
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