Gearlink Kawasaki rider Glenn Irwin produced an assured performance in the wet to earn his second Motorpoint British Supersport victory of the season at Cadwell Park.
The Carrick man, who sealed his maiden triumph in the class at Brands Hatch in tricky conditions earlier this season, took the win by three seconds from Smiths Triumph rider Billy McConnell, whose team-mate Graeme Gowland completed the top three, a further 3.6 seconds down on the winner.
It was a terrific result for the 25-year-old in the feature race at the Bank Holiday meeting, who has now moved into fourth place in the championship standings.
Irwin, fourth in Sunday’s Sprint race, said: “I pushed really hard at the start and the Gearlink Kawasaki has such a good set-up in the wet and the dry.
“I built up a bit of a lead and decided to slow down a bit near the end, only to find that my lap times got faster.”
Mar-Train Racing’s Alastair Seeley, sixth on Sunday, dropped further behind in the title race after failing to finish the race but remains in third position overall in the standings.
The 34-year-old is 38 points behind series leader McConnell, with Gowland in second place, only eight points behind his team-mate.
Irwin, who made his road racing debut at the Ulster Grand Prix in the Supertwin 650 class, is 65 points behind Seeley in fourth position.
Meanwhile, Jordanstown rider Andy Reid capitalised on a mistake by Mason Law to win the National Superstock 600 race.
The FFX Yamaha rider crossed the line with 8.6 seconds in hand over Joe Collier after Law crashed while leading with two laps remaining.
Championship leader Kyle Ryde finished fifth, but Reid has closed the gap at the top to 12 points.
Castlerock man Marty Nutt made it a treble for Northern Ireland riders as he wrapped up victory in the second Ducati TriOptions Cup race by 0.128 seconds from Dennis Hobbs.
In the MCE British Superbike Championship, Milwaukee Yamaha’s Tommy Bridewell won his first race in the class by only 0.005 seconds from Shane Byrne on the Rapid Solicitors Kawasaki, with veteran Chris Walker completing the rostrum places on the Quattro Plant Kawasaki ahead of Josh Brookes (Milwaukee Yamaha).
In race two, RAF Reserves Honda rider Peter Hickman mastered the atrocious conditions to bag his maiden BSB success by 3.398 seconds from Byrne, with Bridewell back on the rostrum in third.
Hickman has been in excellent form this season, earning the Best Newcomer accolade at the North West 200, Isle of Man TT and Ulster Grand Prix after making his debut at each event.
Meanwhile, Marshall Neill and David Haire claimed a victory apiece in the re-run Irish Superbike meeting at Kirkistown on Saturday.
The event was cancelled in June due to bad weather but went ahead on Saturday at the Co Down circuit, promoted by the Belfast and District Club.
In the first Ards Tourism Superbike race, Portadown man Neill won by 2.607 seconds on the Ryan McGill Joinery Kawasaki Superstock machine from Cody Nally after eight laps.
Phillip McNally claimed the final rostrum position, seven seconds down on Nally, with Alistair Kirk, Raymond Clarke and Paul Demaine the top six.
In race two, David Haire (DHR Kawasaki) powered clear to win from Nally by almost three seconds, with race one winner Neill failing to finish.
Kirk finished third ahead of Damien Byrne and McNally, with Declan Hoey sixth.
In the Supersport class, Christian Elkin emerged victorious in the opening race by 0.185s from Robert Kennedy and Carl Phillips, with Jason Lynn, Richard Glasgow and Nikki Coates the first six.
Lynn ground out victory in race two on the Walter Bell Suzuki, with Lisburn rider Phillips on the Sandown Yamaha finishing as the runner-up, only 0.215s behind at the line after seven laps of the 1.512 miles circuit.
Coates came through to finish third followed by Elkin, Jamie Patterson and Robert English.
Elkin won both Moto3/125GP races with Thomas Lawlor and Stephen Titterington clinching a double in the 250GP and Pre Injection classes respectively.