UCD got their defence of the Collingwood Cup off to a perfect start with a 2-0 win over the Royal College of Surgeons at the Trinity College Sports Ground, despite a stellar performance from Surgeons' goalkeeper Jamie Clerkin.
For all his best efforts, and after keeping out shots from Samir Belhout and Paul Corry, the 'keeper could do nothing about Corry's 69th-minute penalty, which the midfielder cleanly dispatched after full-back Jack Halligan had handled on the line.
Cormac O'Brochlain wrapped things up five minutes from time when he headed past Clerkin after Corry had set him up.
Dark horses DCU had a comfortable 3-0 victory over NUI Maynooth, with Anthony Costigan pulling the strings in midfield for the northsiders.
After testing Maynooth 'keeper Eric Lawless twice in the opening minutes, Costigan turned provider for Colin Richardson on the half-hour mark, and the striker bagged the opener with a firm header from 10 yards.
After enjoying the bulk of first-half possession, DCU were nonetheless lucky to go two up on 42 minutes when Ian Byrne's cross-cum-shot sailed in over a flat-footed Lawless.
Within minutes of the restart Richardson put the contest beyond doubt when a rasping left-foot shot flew in off the upright.
UCC recorded back-to-back first-round wins against Mary Immaculate College despite the best efforts of Mary I's 'keeper Bobby Carroll, whose contribution kept the margin to 1-0.
The Cork side dominated possession throughout and should have had the game wrapped up before half-time.
Carroll's performance kept Joshua O'Shea, in particular, at bay as the striker was denied twice in the first half by stunning saves.
Carroll's goal was finally breached with 12 minutes remaining when Rob Waters rose highest to meet Andy Neville's corner to send his side into the quarter-finals.
UUJ dismissed their northern rivals Queen's with a convincing 3-0 victory after a scintillating display from Ards striker Stephen Doyle.
He set a much fancied Jordanstown outfit on their way with a coolly struck 13th-minute penalty after Stephen Quinn had handled in the box.
With UUJ firmly in control it wasn't long before Mark Kelly made it two, as he side-footed home after Doyle had put it on a plate for him.
Doyle then capped a fine performance with a brilliant individual effort on 80 minutes.