Ryan Farquhar made it a clean sweep of international Supertwin victories in 2012 with an authoritative display in the 650cc class at the Ulster Grand Prix.
Farquhar was never troubled as he soon took over the lead of the re-run race from his KMR Kawasaki team-mate Jamie Hamilton on the first lap.
He had held a commanding advantage when the initial Supertwin event was halted due to an incident on the third lap before being re-scheduled over a reduced four-lap distance.
Hamilton tried in vain to cling on to the rear of his mentor's ER6 but the experienced Farquhar had too much class for the former British Superstock 600 champion, who eventually crossed the line in a comfortable second place.
It was Farquhar's ninth triumph at the infamous 7.4-mile Dundrod circuit near Belfast.
He also won the Supertwin events at the North West 200 and Isle of Man TT earlier this season.
Russ Mountford claimed the final rostrum position in third place after an exhilarating four-way scrap involving Ivan Lintin, Ryan Kneen and Adrian Archibald.
Lintin and Kneen tangled together on the fourth and final lap of the race, with the crash resulting in the deployment of the red flags.
Farquhar had completed the four-lap distance when the race was stopped and the key positions remained unaltered on the count-back.
Davy Morgan from Saintfield was another winner for Northern Ireland in the concurrently-run 250GP race.
Morgan had been battling with Paul Robinson before the Ballymoney rider was a retirement at the end of the penultimate lap due to mechanical trouble on his TSR 250cc Honda.
It was Morgan's second career international success after he won the 250cc race at the North West 200 in 2005.
Northern Irishman Morgan dedicated his victory to English competitor Lee Vernon, who died from injuries sustained in a crash in the Dundrod 150 Superbike race on Thursday.
Ulster riders have dominated at Dundrod so far today, with Michael Dunlop (Superstock), William Dunlop (Supersport), Farquhar (Supertwin) and Morgan (250GP) making it onto the top step of the rostrum.