Following the second round on June 21, local rider Cameron Stronach leads the premier superbike class on 129 points with Ralph Mammoliti on 122 and Anthony McFadden on 110.
Stronach went into the round in second place but after two wins and a third place, he moved to the top spot.
In the B grade series, Chris Brown holds the lead on 135 points ahead of Ashley Fleming on 112 and Steve Chittendon on 85, while Mike Howden leads the C grade on 126 points followed by Neil Fraser on 108 and Alex Scaglioni and Anton Jones tied on 93.
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READ NOWIn the supersport class, Thyron Van Vuuren started the day with a win but a crash in the second saw him to the back of the grid for race three, where he managed to make up some ground to finish second.
He trails the championship by one point from Livio Zampieri on 104 points, with Ray Tschorn and Leigh Boujos equal third on 98.
Zampieri also leads the B grade series on 113 points from Van Vuuren on 108 and Boujos on 107, while in the C grade, Tschorn leads on 123 points ahead of Rhys Clay on 107 and David Carroll on 86.
In the 125GP division, veteran Colin Boujos blitzed the first race with a 20-second win over Dave Noblett and David Manson but it is Dave Doughty who leads the championship on 108 points from Manson on 107 and Jack Twisse on 102.
Tim Boujos leads the 300 production four-stroke series on 95 points from Michelle Marais on 74 and youngster Lachlan Hickey on 64.
In the 250cc class, Joel Hunter is tied for the lead with Hickey.
In the sidecars, Jero Joyce and Corey Blackman took their second consecutive clean sweep to lead the championship with 100 points.
Sunday's practice and qualifying starts at 8.40am with racing from 10.30am and 1pm.