An opportunist goal from corner-forward Daithi Ó Cathmhaoil nine minutes into the second half was the decisive score as Coláiste Eoin from Stillorgan defeated St Joseph's in Rochfortbridge to reach the quarter-finals.
The visitors led by 0-5 at 0-1 at half-time, mainly due to some fine place-kicking from Alex O Maoilmhiaidh.
They also kicked eight wides in this opening period.
The home side failed to score from play throughout the entire game, but a free from Ian Hyland in the 34th minute left just three points between the sides. However, less than five minutes later, what seemed like an innocuous long-range shot by Roibeard Blighe was fumbled by Joseph's 'keeper Kymann Power and Ó Cathmhaoil reacted smartly to boot the ball into the unguarded net.
In the dying moments a nasty melee ended with the referee issuing a straight red to the losers' Joey Boyle.
SCORERS -- Colaiste Eoin: D Ó Cathmhaoil 1-3 (2f), A Ó Maoilmhiaidh (2f), M Mac Donncha 0-2 each, G Ó Fógartaigh, D Ó Caoimh 0-1 each. St Joseph's: C Slevin 0-4 (4f), I Hyland 0-1 (f).
ColAiste Eoin, StillorgaN -- D Ó Sionóid; G Mac Aogáin, L Ó Treasaigh, J Clintiún; C Mac Béinéid, E Ó Dochartaigh, R Blighe; J Mac Suibhne, R Mac Daibhéid; C Ó Néill, M Mac Donncha, G Ó Fógartaigh; A Ó Maoilmhiaidh, D Ó Caoimh, D Ó Cathmhaoil. Subs: C Ó Deaghdha for Ó Maoilmhiaidh (39), F Motherway for Ó Fógartaigh (53).
St Joseph's, Rochfortbridge -- K Power; J Guiden, D Judge, L Wallace; R Greville, M Glennon, J Boyle; J Gonoud, A Boardman; T Dowling, C Slevin, S Corcoran; S Murtagh, A Flanagan, I Hyland. Sub: S Deegan for Hyland (43).
REF -- A Lagrue (Kildare).