Leinster maintained their 100 per cent start to the URC season thanks to a 24-6 point win over the Lions at the Aviva Stadium.
Caelan Doris, Josh Van Der Flier and a penalty try gave the Blues their 6th win of the season.
They are the only unbeaten team left in the competition.
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Munster suffered a heavy defeat in Durban with a 41-24 loss away at the Sharks.
Ulster let a 19 point lead slip to fall to a 21-19 defeat to Cardiff while Connacht strolled to a 31-7 victory over the Dragons.
