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The five-round series was launched at Mike Pero Motorsport Park on Saturday afternoon.
The first race went to Christchurch rider and favourite Alastair Hoogenboezem. Hoogenboezem's teammate and fellow Christchurch rider Jake Lewis took the No 2 spot. Damon Rees, who rocketed from last place to third at the final flag, set a new Ruapuna lap record of 1min 29.189sec.
Rees then backed that up with two superb race wins on Sunday, and was the overall winner of the Superbikes class at Ruapuna, although this has been declared provisional as engine checks are yet to be undertaken on several machines.
Hoogenboezem added a pair of runner-up placings to his scorecard on Sunday.
He was highly-satisfied with his performance.
"I'm pretty happy with that," Hoogenboezem said.
"Damon (Rees) has been racing in Australia all last season, so it feels like a win achieving this against him.
"The grids might be a little down on numbers, but certainly there's plenty of talent out there on the track and I'm happy with my results here."
In addition to the Superbikes lap record achieved by Rees, Whangarei's Jason Hearn set a new time of 1min 44.404sec for the Supersport 300 class and Invercargill's Cormac Buchanan set a new time of 1min 59.06sec for the inaugural Supersport 150 class.
- Upcoming 2020 NZ Superbike Championships rounds
Round 1 - January 11-12, Mike Pero Motorsport Park, Christchurch
Round 2 - January 18-19, Levels International Raceway, Timaru
Round 3 - March 7-8, Hampton Downs Motorsport Park, North Waikato, Mike Pero MotoFest
Round 4 - March 28-29, Circuit Chris Amon, Manfeild, Feilding
Round 5 - April 4-5, Bruce McLaren Motorsport Park, Taupo