Franco Bourne took victory by 1.703secs as he beat Lewis Jones to the first race win.
Aaron Silvester took third, a further 2.385secs behind as Edmund Best was fourth and Zak Shelton rounded out the top 12.
Pirelli National Junior Superstock Championship with MotoNovo, Brands Hatch, Race One:
1. Franco Bourne (Marvel HCM Motorsport)
2. Lewis Jones (Lewis Jones Racing) +1.703s
3. Aaron Silvester (A&J Racing) +4.088s
4. Edmund Best (Symcirrus Motorsport) +11.176s
5. Zak Shelton (Merlin Motorsport) +11.593s