Full-back Conor O'Shea helped himself to a brace of tries as Castleknock College ran out comfortable winners over Cistercian College Roscrea in Newbridge.
Out-half Cian Doddy, who also landed two conversions, got the scoring under way with a 22nd-minute penalty.
From the restart, Roscrea moved the ball towards the Castleknock line, but once it was turned over Luke Reilly led a devastating breakaway that went the entire length of the pitch and ended with O'Shea going over.
Ryan Merrells scored the second try before the break and O'Shea pounced again three minutes after the restart to seal victory.
Castleknock College -- C O'Shea (D McConville 60); M McQuillan (K Doyle 50), S McEntagert, K Dixon, L Reilly (C O'Doherty 50); C Doddy, C Lynch; S O'Hehir (M Jenkins 59), T Hanlon (C Fagan 55), Z Butt; R Merrells (A Healy 55), J O'Sullivan; C Gleeson, D Moran, N O'Riordan.
CC Roscrea -- D Levelle; R Wharton, F Higgins, H O'Connell (T Carroll 46), K Drea; C O'Leary (T Foley 46), C Quinn; J Duggan, J Sweetman, R Tynan; P Gavin, P Ennis; M Kelly, A McDermott, J Foley.
Ref -- A Fogarty.