Glentoran moved into the next round of the ToalsBet Senior Shield following a commanding 3-1 win against Linfield at the Oval in east Belfast.
The home side took an early lead within two minutes when James Douglas beat the Linfield defence and set up Jordan Jenkins, who fired low past Aidan Glavin to give the Glens the advantage.
Jenkins struck again inside six minutes of play to ensure the home side could not be caught out by a late Blues comeback attempt.
Cal Weatherup added a third goal in the closing stages to seal the victory for the Glens.
Linfield were unable to find an equaliser despite pressure from their visitors throughout the match.
At Seaview, Crusaders defeated Carrick Rangers 2-2 before progressing through a penalty shootout won 5-4 on the day.
Jacob Blaney and Owen Wardell put the home side ahead early in the contest against the holders.
Danny Gibson scored for Carrick shortly after they received a red card, heading home a rebound from his own penalty which had been saved by Shea Callister.
The match remained level until substitute Weatherup scored in stoppage time to give Crusaders a two-goal cushion before the final whistle.
Jordan Chapman struck for Linfield in the second half to threaten a fightback against Glentoran's defence.
Full-time results across the competition included Ballyclare Comrades losing 4-5 to Ards and Cliftonville defeating Knockbreda 4-0.
Ballymacash Rangers were comprehensively beaten by Ballymena United 0-6, while Larne won 4-0 against Newington.
H&W Welders lost 0-4 to Bangor in another fixture on the day.
The County Antrim Shield first round concluded with these outcomes as teams sought progression through the tournament.
Crusaders had entered the match with confidence following an impressive victory over Glentoran in the Irish Premiership earlier in the season.
Callister joined Crusaders on loan from Derry City during the summer transfer window.
The Glens' passing rhythm was evident throughout their performance against Linfield at the Oval.
Josh Kelly was picked out by Cooney but could not beat Glavin to extend the lead after the half-hour mark.
Jordan Jenkins struck twice in the opening six minutes to hand the home side a dream start in east Belfast.
The Blues could not find a way back level as Cal Weatherup restored the home side's two-goal advantage in the closing stages.
Full time results confirmed Ballyclare Comrades 4-5 Ards, Ballymacash Rangers 0-6 Ballymena United, Cliftonville 4-0 Knockbreda, Crusaders 2-2 Carrick Rangers (Crusaders win 5-4 on penalties), Glentoran 3-1 Linfield, H&W Welders 0-4 Bangor and Larne 4-0 Newington.
The County Antrim Shield first round concluded with these outcomes as teams sought progression through the tournament.