Mike Ruddock's U20s ran in four tries, with two from man of the match Jack O'Donoghue, to beat Scotland 34-7 at a rain-soaked and windy Dubarry Park in Athlone.
The contest was effectively over before half-time when Ireland built up 20-0 lead against a Scottish team who barely managed any forays into the Irish half.
Leinster’s Ross Byrne kicked the hosts into an early 6-0 lead and Ireland regularly burst through the Scottish lines but failed to make any headway on the scoreboard until O’Donoghue finally got the first try on 33 minutes, instigated by out-half Byrne from a scrum on Scotland’s 22.
Peadar Timmins stretched the lead just before the break, squeezing in a try through the Scots’ defence after another Byrne lay off.
Byrne then made it 20-0 with the conversion, his fourth successful goal from five attempts in what were becoming increasingly atrocious conditions.
Ireland’s handling, and especially the scrimmaging, went awry in the second period but whatever dominance the Scots managed to gain in the scrum was not put to effective use and Ireland continued to have a stranglehold on the hapless Scots.
O’Donoghue went over for his second try as Ireland’s scrum finally got its act together, the number eight biding his time from the drive to get over the line to make 25-0, followed by a Byrne conversion.
Waterford man O’Donoghue departed almost immediately as he appeared to twist his knee while scoring his try.
Oisin Heffernan came off the bench to give Ruddock’s youngsters some more powerful carrying to soften the blow of losing O’Donoghue, with Heffernan nailing a try with Byrne adding the extras.
Scotland’s replacement scrum-half Ben Vellacott grabbed a late consolation score in the last play of the game, chipping the ball at the try-line and winning the chase to deny Ireland clean sheet.
Ireland U20: D Busby; A Byrne, G Ringrose, P Robb, I Fitzpatrick; R Byrne, N McCarthy; P Dooley, M Abbott, R Burke; S O'Brien, R Molony; P Timmins, D Leavy, J O'Donoghue.
Replacements: S Delahunt, J Walshe, O Heffernan, J Joyce, R Moloney, J Cullen, C McKeon, D Goggin.
Scorers: Byrne 2 pens, 4 con; O’Donoghue 2 tries, Timmins try, Heffernan try.
Scotland scorers: B Vellacott try; B Cooper con.