It was a defining day in Division 3 of the Dublin Adult Football League as Clontarf confirmed top spot following their 1-14 to 2-8 victory over Trinity Gaels in Druimnigh last Saturday teatime.
With nearest challengers Na Fianna losing to Scoil Uí Chonaill, Clontarf's league title was secured after an exceptional season in which they have suffered just a solitary loss to date.
Hoping to follow their neighbours into AFL2 are Scoil Uí Chonaill, who maintained their play-off ambitions when overcoming Na Fianna by 0-15 to 0-11 on the Clontarf Road.
The foundation for their victory lay in a solid defensive showing in which corner-back Conor O'Donovan was outstanding and he received admirable defensive support from full-back Alan Cronin and centre-back Johnny Bowden.
Further up the field, Donncha Fenton and Eoin O'Carroll shared eight points over the hour and with Neil O'Flynn looking lively in attack, the hosts secured the precious two points thanks to scores by Aidan Mulvey, Lewis Cassidy, Danny Nolan, Tiernan Crowe and Michael McCloskey.
Hot on their heels remain Naomh Olaf, with midfielder Conor Haskins hugely influential as they narrowly defeated Whitehall Colmcille by 1-10 to 1-9 in Páirc Uí Bhriain.
Eoin Kinsella struck a priceless 1-4 for the hosts while Colin Doyle and Mark Doyle were equally instrumental for the Balally outfit.
In AFL4, Ballymun Kickhams made up for the disappointment suffered by their senior team on Saturday as they confirmed their league title with a 0-12 to 0-9 success over nearest rivals Good Counsel at Páirc Ciceam.
The hosts were inconvenienced by early injuries to defenders Keith Roche and Thomas Hayes but they showed admirable spirit with captain Simon Lawler recording two crucial points from half-back.
Goalkeeper Kevin Darcy and Seán Brennan also shone while in attack Andy O'Brien, Eddie Christie and Dillon Keating shared eight points.
Raheny strengthened their promotion chances with Shane Homan's goal confirming a 1-18 to 2-10 win over Round Tower Clondalkin.
AFL3: Scoil Uí Chonaill 0-15 Na Fianna 0-11; St Sylvester's 1-13 St Finian's Swords 0-7; St Mark's 3-6 St Brigid's 1-6; Trinity Gaels 2-8 Clontarf 1-14; Naomh Olaf 1-10 Whitehall Colmcille 1-9.
AFL4: Man O' War 1-11 Crumlin 2-9; Ballymun Kickhams 0-12 Good Counsel 0-9; Raheny 1-18 Round Tower Clondalkin 2-10; Parnell's 0-11 St Margaret's 1-10; St Finian's Newcastle 4-16 O'Dwyer's 1-14; St Brigid's 1-6 St Jude's 2-13.