Max Cook moved a step closer to the title as he beat Franco Bourne to the win in the opening race.
Despite dropping back to second behind Bourne at the start, the polesitter was back in front by the end of lap two and was never challenged again as he powered to the win.
Third was Seth Crump, ahead of Dan Brooks as Aaron Silvester took fifth.
Pirelli National Junior Superstock Championship with MotoNovo, Oulton Park, Race One:
1. Max Cook (Uggly & Co by Binch Pro)
2. Franco Bourne (Marvel HCL Motorsport) +0.874s
3. Seth Crump (Seeeeeth) +5.655s
4. Dan Brooks (R4R Vision Team) +5.756s
5. Aaron Silvester (A&J Racing) +5.941s