Ireland 6 Wales 31
The Welsh youngsters ran in five tries at Blackrock College to keep alive their Grand-Slam ambitions. Centre Ashley Smith gave Wales a narrow 7-6 half time lead with his try, converted by Rhys Jones. But Wales broke loose in the second half with four unanswered tries from wing Alec Jenkins, centre Gareth Maul, fullback Martyn Thomas and replacement second-row Matthew Larsen.
The victory however was tainted by a knee injury to second-row Lou Reed. Wales coach Justin Burnell said: "We are obviously hugely delighted with the win, especially to outscore Ireland five tries to nil in Dublin. That's a big achievement. Out aim now has to be the Grand-Slam."
Wales face Italy and France, both at home, in their remaining games.