Wasps beat Ulster to help Saracens into the last eight of the European Champions Cup.
Dan Carter made his return to a rugby field at home on Saturday when he turned out for his childhood club.
Saracens kept its European Champions Cup defence alive despite Rhys Carre's early red card at Ospreys, while Clermont Auvergne, Toulouse and Exeter Chiefs booked quarter-final spots.
Garry Ringrose scored a hat-trick as last season's runner-up Leinster beat Benetton 33-19 and Clermont Auvergne thrashed Harlequins in the European Champions Cup.
Saracens secured the European Champions Cup for a third time in four seasons after it rallied from a first-half deficit to defeat Leinster 20-10 at St James' Park.
Glasgow Warriors kept their nerve to secure a bye to a home Pro14 semi-final, while Ospreys and Scarlets are set to battle for the final European Champions Cup place.
Billy Vunipola reaffirmed he had no intention of hurting anyone with his support for Israel Folau after playing a starring role in Saracens' European Champions Cup victory over Munster.