A penalty from Ryan Basquel proved crucial as Ballyboden St Enda's overcame St Vincent's by 1-6 to 0-7 in their Dublin U21 'A' Football Championship quarter-final at Páirc Naomh Uinsionn on Saturday afternoon.
In a dour opening half that ended at 0-1 apiece, defences were largely on top with goalkeeper Conor Dooley, full-back Graham Heavey, Stephen O'Connor and the impressive Robbie McDaid the pick of the Boden rearguard.
After falling behind by 0-4 to 0-2 early in the second half, Basquel converted a penalty after a foul on Conor Butler and points by Collie Dunne, Basquel, Ciaran Gibbons and an insurance score from McDaid were enough to see St Enda's home by two points.
At St Anne's Park, Clontarf struck four late, unanswered points, two from Conor Cronin to finally get the better of Skerries Harps on a 0-13 to 1-6 scoreline.
The hosts were dominant in the early exchanges, with centre-back Jack McCaffrey and Fiachra Dodd shining defensively while points from Craig McDonnell and Patrick Mohan helped push them six points clear at one stage.
However, Harps responded well before the interval with two points from Harry Dawson accompanying Paul Cashman's well-taken goal as the visitors trailed by a point at half-time.
It was nip and tuck upon the restart with Niall Dunleavy impressing for Clontarf while substitute Eoin Smith, Dawson and Shane Hickey were equally influential for the visitors.
But Cronin's late contribution and another point by Matias Mac Donncha proved telling at the end.
There was another tight encounter at the 12th Lock with extra-time failing to separate Lucan Sarsfields and Kilmacud Crokes, who finished level on a 2-11 to 1-14 scoreline.
Robbie Mahon plundered both goals for the hosts in the opening half, availing of breaks created by towering full-forward Chris Crummey.
But Crokes remained in the hunt with Paul Mannion causing constant headaches for the Lucan defence.
Philip Smith and Matthew McCaffrey were central cogs in Lucan's encouraging showing while Darragh Stapleton, playing his first competitive club game of the year, chipped in with 0-6 from placed balls as the contest ended level at 2-8 to 1-11 after 60 minutes.
U21 'A' FC: St Vincent's 0-7 Ballyboden St Enda's 1-6; Clontarf 0-13 Skerries Harps 1-6; Lucan Sarsfields 2-11 Kilmacud Crokes 1-14.