Munster managed to salvage some pride from what has been an immensely disappointing Champions Cup campaign with a 26-13 bonus point win over Stade Francais at Thomond Park.
Substitute Sam Davies delivered a commanding performance as the Ospreys fought back superbly to floor French heavyweights Clermont Auvergne in stunning fashion at the Liberty Stadium.
Glasgow Warriors have opted to move their European Rugby Champions Cup match against Racing 92 on January 23 to Kilmarnock's Rugby Park due to a high risk of their Scotstoun pitch being waterlogged.
Ulster staged one of the great European rugby comebacks as they overturned a 23-point half-time deficit in Oyonnax to keep alive their chances of progressing to the last eight in the Champions Cup with a sensational 24-23 triumph.
Despite being down to 14 men for over forty minutes against Munster, Stade Francais all but secured their place in the Champions Cup quarter-finals with a comprehensive 27-7 victory in Paris.
Exeter Chiefs were made to pay for last Saturday's bonus-point win over Clermont Auvegne in the European Champions Cup, losing 42-10 to the French giants in Sunday’s reverse fixture.
Ulster completed a European Champions Cup double over Toulouse to inch themselves closer to the competition’s quarter-final with a narrow 25-23 triumph at Stade Ernest Wallon.
Fijian wing Josaia Raisuge scored a brace of tries as Stade Francais convincingly beat Treviso 40-14 in Paris to maintain the pressure on European Rugby Champions Cup Pool 4 leaders Leicester.
Glasgow Warriors marked their 100th game in the European Cup by doing the double over Guinness PRO12 rivals Scarlets to stay in the hunt for a quarter-final place in the European Champions Cup.
Ospreys' second-half comeback proved in vain but they still collected two losing bonus points in a 33-27 defeat at Bordeaux-Begles to keep their hopes of qualifying for the European Champions Cup quarter-finals alive.
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.