This time Lockwood scored the win that had eluded him on Saturday, battling with McConkey over the first lap then pulling away.
Ryan Yardley carved through the field and overtook McConkey to challenge Lockwood, but the wily ex-V8 racer kept his head and stayed the distance. Yardley was second, consolidating his championship points advantage and Reid Harker set fastest time, a 1:42.336.
Then in Sunday's final race over 12 laps, Yardley had pole and led for the opening laps but the man on a charge was once more Matt Lockwood in the Placemakers TR 86.
On a wet track he carved through the field from his start position of sixth, hunting down and passing rivals Reid Harker, John Penny and Michael Scott to close in on Yardley.
"I said yesterday I was hoping for more rain and we got it! Those opening laps were frantic, but once I got a lead it was just the fight between Ryan and me. He got closer in the last couple of laps but we got the result," said Lockwood.
2016 -2017 Toyota 86 Championship points after two rounds
Ryan Yardley 380
Reid Harker 349
Matt Lockwood 315
Michael Scott 291
John Penny 264
Brody McConkey 227
Ash Blewett 217*
Drew Ridge (Aus) 202
Ben MacDonald 171
Jaden Ransley 164
Will Brown 158*
Connor Adam 158
Mike Lightfoot 157
Jacob Smith 129
Miles Cockram 122
Stokes 90
Martin Short 82**
*Did not race this round
**Did not compete in race three