Leinster have beaten Connacht by 41 points to 12 in the URC inter-pro clash at the RDS.
The Blues scored 7 tries in the bonus point win, with player of the match, Jordan Larmour, bagging a brace.
Earlier Munster came from behind to stun Ulster 15-14 in a thriller in Belfast.
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The hosts were leading by 14 points to 5 with 13 minutes to go at the Kingspan.
But out half, Ben Healy, made the difference off the bench.
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Cardiff missed the chance to go fifth in the table as they suffered a 22-19 defeat to Ospreys.
Scarlets claimed the bragging rights in the other New Year's Day derby - beating Dragons 33-17.