Catholic University School took their chances and then held off a late rally from CBC Monkstown to prevail 15-13 at Merrion Road yesterday.
CUS made their push in the first half, clinching tries by right-wing Colm Driver and centre David Beakie to build a 12-5 lead at the interval, CBC's reply coming from their out-half Mark Rogers.
Mark Hiney's penalty turned out to be the difference as CBC struck for a late unconverted try into the corner by replacement wing Ryan Moore and fell two points short of forcing a replay.
Newbridge bagged three tries -- by full-back John Jennings, wing Phil O'Neill and hooker Charlie Kings -- to slip past a resolute De La Salle Churchtown 25-12 at a cold Sydney Parade.
The wintry conditions made handling difficult and 'Bridge's superiority in this area at crucial periods played a large part in the win.
Out-half Kevin McGrath found himself in the rare position of scoring a hat-trick of tries and still ending up on the losing side for Skerries Community College, who lost 45-22 to Pres Bray in UCD.
Skerries scored four tries -- the other coming from scrum-half Eoghan Carron -- in a rip-roaring encounter.
In fact, McGrath couldn't even claim the consolation of being top try-scorer as Leinster U-19 wing Ferdia Kenny fizzed for four, with centres Karl Devin (2) and Ross Keating completing the set of seven tries.
Wesley saw off Templeogue 30-7 at Anglesea Road, with three tries coming from centre Robert Bracken, right-wing Andrew Walsh and open-side flanker Harry Bowers.
In addition Greg Hawe kicked 15 points, with Templeogue restricted to a try by prop Tom O'Reilly, converted by Eoin Treacy.