Fenton Seabright claimed victory by just 0.002secs over points leader Kas Beekmans as championship hopeful Asher Durham crashed out at the final corner.
Seabright took charge and led early in the 10 lap race and although both points leader Beekmans and Durham both led for a lap around half distance, the FHS Racing rider was back ahead with three to go.
The top four, which also included Alfie Davidson, were all together as they entered the final lap and Durham tried to make a move for the front at the final corner but crashed out, leaving Seabright and Beekmans to charge to the line.
Seabright took the win in a photo finish as Davidson was third, Ferre Fleerackers fourth and Rhys Stephenson fifth.
Pirelli National Sportbike Championship, race result:
1. Fenton Seabright (FHS Racing)
2. Kas Beekmans (VLR/NIWA Racing) +0.002s
3. Alfie Davidson (SENCAT by Swan Racing) +0.268s
4. Ferre Fleerackers (B.art Racing Team) +7.278s
5. Rhys Stephenson (Rocket Racing) +8.834s
Championship positions after Round 10:
1. Kas Beekmans 260
2. Fenton Seabright 209
3. Ferre Fleerackers 209
4. Asher Durham 191
5. Harrison Dessoy 186