The 2011 Heineken Cup final man of the match Jonny Sexton put the boot into Leinster's old rivals Munster to steer the reigning European champions to a morale boosting 24-19 RaboDirect PRO12 win at the AVIVA Stadium.
A week before they launch the defence of their Heineken Cup crown with a trip to France to face tournament new boys Montpellier, the Dublin-based outfit extended their unbeaten run at the home of Irish rugby to five matches.
Sexton was instrumental in a victory that took Leinster to the top of the PRO12 table as he kicked seven penalties. Leinster's other points came from a drop goal by Rob Kearney.
In his first game since returning from the World Cup, Sexton landed five first-half penalties to give his side a 15-9 advantage. Opposite number Ronan O'Gara landed four penalties of his own and also converted a penalty try that helped set-up a frantic finish in front of crowd of 48,365.
Munster had Denis Leamy sent to the sin-bin in the second half and that allowed Leinster to stretch their lead to 24-12. But then the home side had British & Irish Lions No 8 Jamie Heaslip yellow carded and the Munster rally closed the gap to five points.
While Leinster head to France to face last season's French Championship runners-up Montpellier at Stade de la Mosson in Pool 3 on Saturday, 12 November, Munster host the side Leinster beat in the Heineken Cup final at the Millennium Stadium in May, Northampton Saints, at Thomond Park in a crucial Pool 1 clash on the same day
Finals Edition: Listen to the best guide to the European Rugby Cup Finals weekend in Dublin, which sees Leinster Rugby take on Stade Francais Paris at the RDS on Friday night in the Amlin Challenge Cup Final and then ASM Clermont Auvergne tackle Toulon in an all-French affair at the Aviva Stadium on Saturday.