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.
As head coach Stuart Lancaster polishes the axe he will soon wield over his World Cup training squad, Exeter Chiefs coach Rob Baxter has backed Jack Nowell, Henry Slade and Luke Cowan-Dickie to be given a stay of execution.
Italy Under-20s held off a late Samoa blitz to retain their place in the World Rugby U20 Championship on Saturday and head coach Alessandro Troncon believes the experience will have served as a valuable lesson for his young troops.