Aaron Silvester beat Taylor Rose to the first round honours in a shortened Junior Superstock battle, clinching the win by 0.151s.
The lead swapped several times between a number of riders, with Cameron Dawson hitting the front on lap three, before Silvester took the lead on lap nine.
The race was stopped at the end of lap 13 after a crash further down the field, with Dawson taking third, polesitter Owen Jenner fourth and Edmund Best fifth.
Pirelli National Junior Superstock with Santander Consumer Finance, race result:
1. Aaron Silvester ( A&J Racing)
2. Taylor Rose (TRR27-Verkade Racing) +0.151s
3. Cameron Dawson (MSS Performance) +0.452s
4. Owen Jenner (Jenner Racing) +0.842s
5. Edmund Best (Symcirrus Motorsport) +1.149s