David Shoubridge took control of the championship with another double win a Donington Park after another close battle with Tom Tunstall.
Shoubridge ended up winning by 1.268s after another two-man scrap as once again, former champ Philip Atkinson took third, albeit 19 seconds back.
Connor Rossi Thompson was the fourth rider across the line, half a second ahead of fifth-placed Max Lofthouse.
Ducati Performance TriOptions Cup, Donington Park, Race Two:
1. David Shoubridge, Rich Energy Ducati
2. Tom Tunstall, Motorcycle Race Parts +1.268s
3. Philip Atkinson, Q-Oil Treatments/Unique Motorsport +19.698s
4. Connor Rossi Thomson, Thompson Haulage/Connor Thomson Racing +22.669s
5. Max Lofthouse, JDF Racing +23.198s