Alastair Seeley completed a British Supersport double after winning Sunday's race at Donington Park.
The Carrickfergus rider, who won the opening race on Saturday, is 36 points behind series leader Ben Wilson.
Michael Laverty was second in the first British Superbike race but crashed out in the second race.
Clogher's Keith Farmer has secured the Metzeler National Superstock 600 Championship title two rounds early after finishing sixth on Sunday.
Farmer clinched the crown after main rival Connor Behan retired after crashing.
Glenn Irwin won Sunday's Superstock 600 event.
Laverty, who is fourth in the Superbike series, was forced to retire in race two after colliding with Shane Byrne on the opening lap.
Castlerock's Marty Nutt was 17th in the first Supersport race but failed to finish the second.