Michael Dunlop clinched two victories and set a new lap record at the Tandragee 100, although the feature race was abandoned due to rain.
Ballymoney rider Dunlop clocked a new best of 109.29mph in the Open race as he edged out Ryan Farquhar by 1.3 seconds with John Burrows third.
He beat Farquhar, who won Moto 450 and Supertwins events, again in the Supersport 600 with a record 108.35 lap - Adrian Archibald was third.
William Dunlop won the 125s and 250s.
Dungannon rider Farquhar came in ahead of Archibald and Burrows in the Supertwins.
Nigel Moore and Wayne Kennedy completed the 125 podium while Seamus Elliott was second and Davy Morgan third in the 250s.
Michael Dunlop was riding the Paul Bird-prepared Kawasaki Superbike for the first time in the Open race.
Farquhar came into the meeting with 12 victories from his 12 races this season.