Toulon turned on the power in the second half to secure a 20-16 win at the Aviva Stadium and end Leinster's interest in this season's European Champions Cup.
Fly-half Jimmy Gopperth scored 23 points as Wasps recorded their second away win of their European Champions Cup campaign to remain firmly on course for the knockout phase.
Chris Ashton scored a hat-trick of tries as Saracens remained unbeaten in all competitions this season with a convincing 55-13 European Champions Cup Pool 1 victory over Top 14 strugglers Oyonnax at Allianz Park.
Northampton's English contingent failed to make a substantial impression in front of a watching Eddie Jones as the new England coach resumed his busy pre-Christmas scouting tour of the Aviva Premiership clubs.
George Ford kicked a match-winning conversion with the game's final kick as Bath dramatically ended Wasps' unbeaten European Champions Cup record with a 25-23 victory in front of England head coach Eddie Jones.
Reigning champions Toulon got back to winning ways in the European Champions Cup and sent another triple winner Leinster out of the reckoning for another title with a 24-9 defeat at Stade Mayol.
Saracens maintained their unbeaten start to the season and took a stranglehold on Pool 1 of the Champions Cup with an emphatic 45-10 bonus-
point win over tournament newcomers Oyonnax.
Dan Biggar scored all 19 points to keep Ospreys joint top of Pool Two in the European Champions Cup, but it was an unconvincing performance from the hosts.
Following a postponement in Paris and a home defeat to Northampton, Glasgow scored six tries to win their first European game of the season, beating Scarlets 43-6.
Glasgow head coach Gregor Townsend wants his men to learn lessons from their last meeting with Scarlets ahead of Saturday's European Champions Cup clash.
After just two rounds of European rugby this season, including some teams having only played a solitary game, the prognosis is already dire for the Guinness PRO12 sides.
Following the northern hemisphere’s fairly disastrous Rugby World Cup campaign, there has been a heavy focus on youth rugby in Europe and whether or not players are being trusted early enough.
Tournament organisers have announced that five European Champions Cup pool games postponed earlier this month following the Paris terror attacks will take place in January.