Mawson, who started from pole, looked to get an early reprieve when series rival James Golding went off at Turn 3 on the opening lap.
The reigning Australian Drivers’ Championship then spent the next few laps establishing what looked to be a comfortable lead which, at its peak, was over two seconds.
However a late charge from Tasman Series winner Cameron almost bought Mawson undone, the pair going wheel to wheel in a thrilling last-lap battle.
In the end Mawson was just able to hold on, the gap at the flag just four-tenths.
Former Supercars full-timer Zane Goddard came home third ahead of Nathan Herne and Tim Macrow.
Cooper Webster was sixth followed by Kaleb Ngatoa and Golding, who recovered to eighth ahead of Ben Bargwanna and Shae Davies.
The third round of the Australian Drivers’ Championship continues with a second race tomorrow evening.
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