Leinster moved closer to the league title after securing their most important win of the season, 21-12 over Munster at the RDS.
Felipe Contepomi kicked Munster out of the title race as he landed six penalty goals from eight attempts in this niggly inter-provincial clash.
Jonathan Sexton topped off the win on Saturday with a late drop goal as the league leaders put 12 points between them and the second-placed Cardiff Blues.
Worryingly for Munster, with their Heineken Cup semi-final trip to Saracens just a fortnight away, half-backs Ronan O'Gara and Peter Stringer both picked up injuries.
O'Gara did not return for the second half after injuring himself at a ruck, while Stringer had to be stretchered off in a neck brace after his team-mate Anthony Foley accidentally caught him with an elbow.
England Under-18 head coach John Fletcher insists his young side will be better for the experience after beating Italy in the bronze final to round out their 2015 Rugby Europe U18 Championship campaign in style.