Leinster beat defending champions La Rochelle at the fourth time of asking, battling to a 16-9 away Champions Cup win in dreadful conditions.
Sale produced a superb second-half show to open their Champions Cup campaign with a 28-5 victory over Stade Francais at AJ Bell Stadium.
Jack Crowley missed a last-gasp drop-goal as Munster were held to a draw at home to Bayonne in Champions Cup Pool 3, with the French side striking late.
Henry Slade held his nerve as Exeter launched their Champions Cup campaign with a stunning 19-18 victory over Toulon.
Tommy Freeman scored two tries as Northampton opened their Champions Cup campaign with a three-try 28-19 victory away to Glasgow.
The premier club competition in rugby returns this weekend in the form of the Champions Cup, but it does so in a new format.
Owen Farrell will make his first appearance since his decision to step away from Test rugby was announced when Saracens launch their Champions Cup campaign.
Ireland captain Johnny Sexton has been hit with a three-game ban - but will be able to play in the Rugby World Cup later this year following a disciplinary hearing.
A magnificent comeback from 17 points down saw La Rochelle become back-to-back Champions Cup winners vs Leinster 27-26 in Dublin.
Recap all the updates from Saturday's 2023 Heineken Champions Cup final between Leinster and La Rochelle in Dublin.
Defending Champions Cup holders La Rochelle set up a repeat of last year's final against Leinster with a 47-28 win against Exeter in Bordeaux.
Leinster booked a home Heineken Champions Cup final place, as they clinically dispatched Toulouse 41-22 at the Aviva Stadium in Dublin.
Jack Nowell has avoided a ban for criticising referee Karl Dickson on Twitter, with the RFU confirming he has been fined £10,000.
La Rochelle will face Exeter in the Champions Cup semi-finals in Bordeaux after they clinically despatched Saracens 24-10.
A round-up of Saturday's Champions Cup quarter-finals as Toulouse thrashed the Sharks to book a semi-final meeting with Leinster, while Exeter also progressed.
Leinster moved within 80 minutes of a Heineken Champions Cup final on home soil after seeing off Leicester Tigers' challenge with a 55-24 win at the Aviva Stadium.
Exeter progressed to the European Cup quarter-finals in dramatic circumstances, while Saracens and Toulouse also won.
Leinster booked passage through to the Heineken Champions Cup quarter-finals as they outmuscled Ulster 30-15.
Jasper Wiese scored the only try as Leicester reached the European Cup quarter-finals with a 16-6 win over Edinburgh.
Edinburgh had to settle for a Heineken Champions Cup last-16 away tie at Leicester despite beating Saracens 20-14.