Munster have beaten the Scarlets by 17 – 14 in Llanelli.
Niall Ronan crossed the line for the Irish province, the rest of the scores came from the boot of Ronan O’Gara.
Earlier Connacht were beaten by Gloucester in their pool 6 showdown at the Sportsground.
It finished Gloucester 14 – Connacht -10.
Last season’s beaten finalists Northampton now have 3 out of 3 losses in the tournament after going down 41-22 at Castres
In the other Heineken Cup game, Benetton Treviso beat Biarritz 30-26………