An assured kicking display from Jonathan Sexton and two second-half tries drove Leinster to a deserved 36-16 win over Brive at the Stade Municipal.
The defending Heineken Cup champions' first win in Pool Six was founded on Sexton's kicking haul of 19 points, with the tries coming from Lions full-back Rob Kearney and young replacement Kevin McLaughlin, who bagged a late double.
England fly-half Andy Goode landed two first-half penalties for Brive, whose best moment came after the hour mark when their South African flanker Gerhard Vosloo scored a converted try.
Leinster top Pool Six at least until Ospreys host Clermont Auvergne tomorrow.
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.