Marley Mackenzie became the first Scottish winner of the day at Knockhill, as he destroyed the opposition to win by 10.346secs.
The championship leader had already used his local knowledge to take pole and proved to be unstoppable as he flew off the line and into the lead of the 15-lap race – and was never challenged.
Laken Payne slotted into second and ended up in a lonely race with himself as he stayed p2 all the way to the flag.
Behind, it was a battle for the final podium spot as Ben Joliffe passed Luca Wilkinson for third on Lap nine.
Wilkinson, however, kept in close contact with his rival in the closing laps and made the move on the final lap, taking back position to claim third.
Joliffe crossed the line fourth with Luca Hopkins fifth.
1pMobile National Junior Sportbike Championship, Race One result:
1. Marley Mackenzie (Kirkcaldy Kawasaki)
2. Laken Payne (LP 41 Racing) +10.346s
3. Luca Wilkinson (Speedyfreight/NW Racing) +13.260s
4. Ben Jolliffe (Dunsley Heat Racing) +13.317s
5. Luca Hopkins (Team SBR powered by DKS Drilling) +13.419s