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Mariners captain Oliver Bozanic slotted home a penalty with seven minutes remaining to earn the visitors a point in a contest they largely dominated.
The draw takes last season s wooden-spooners three points clear at the top, though having played two matches more than second-placed Melbourne City.
After a Matt Simon goal in the first half, the impressive Mariners created enough chances to be well out of sight before substitute Bruce Kamau bagged two goals within four second-half minutes against the run of play.
Gosford-local Simon looked set to be the hero, netting midway through the first half until Kamau finally drew the home side level with 16 minutes remaining.