Munster bounced back from a disappointing defeat to Bath last week to comprehensively beat Gloucester 31-3 in the Champions Cup at Páirc Uí Chaoimh in Cork.
An astonishing start which saw Bath 28-0 ahead inside 19 minutes proved crucial as the Prem side saw off Munster 40-14 in their Champions Cup opener.
Bath snatched a 36-29 victory over Saracens that propelled them two points clear at top of the Gallagher Prem.
Tommy Freeman ran in four tries as Northampton Saints fought back to defeat Saracens 43-31 in Gallagher Prem clash.
On Saturday, a 19-year-old by the name of Noah Caluori stunned the rugby world by remarkably scoring five tries for Saracens vs Sale Sharks on his first Prem start.
England's Steve Borthwick says Owen Farrell is concentrating on playing for Saracens in the Prem for now, but adds he is watching all eligible English players.
Billy Searle's penalty with the final kick of the game secured Leicester a dramatic 22-20 victory over Gallagher Prem champions Bath.
Marcus Smith's return inspired Harlequins to their first win of the Prem season as Saracens saw their perfect start come to an end with a 20-14 loss at The Stoop.