Michael Rhodes and Billy Vunipola scored tries but Owen Farrell's 22 points from the tee were key for Saracens against Munster.
Leinster will be led by the fit-again Johnny Sexton when they take on Toulouse in Sunday's European Champions Cup semi-final.
Sunday's semi-final against Leinster will see Toulouse players wearing a special kit that includes an image of Notre Dame.
Munster are not optimistic over their chances of being able to count on Joey Carbery against Saracens in the Champions Cup on Saturday.
Munster have secured the future of head coach Johann van Graan until 2022. The South African signed a new deal on Monday.
Ahead of the 2019-20 season, Ulster have completed a sensational swoop for Ireland prop Jack McGrath from Leinster.
Dan Leavy sustained a serious knee injury in Leinster's European Champions Cup win over Ulster and will be sidelined until next season.
Toulouse played almost an hour with 14 men but were still able to beat Racing 92 in a magnificent European Champions Cup quarter-final.
Jacob Stockdale's failure to ground a second-half try proved costly as Ulster fell to a narrow Champions Cup loss at Leinster.
Owen Farrell missed Saracens' Champions Cup win over Glasgow Warriors as his wife went into labour before kick-off.
Johnny Sexton will not be risked for Leinster's Champions Cup quarter-final, but Maro Itoje and Stuart Hogg are set to return this weekend.
A spectator who abused Simon Zebo during Ulster's Champions Cup meeting with Racing 92 has been given a lifetime ban by the Pro14 club.
Wasps saw three England squad members suffer injury scares on Sunday but Dai Young does not foresee any issues ahead of the Six Nations.
Any hopes Toulouse had of snatching top spot in Pool 1 were extinguished as Leinster defeated Wasps to secure a home quarter-final.
Both Edinburgh and Glasgow Warriors are through to the European Champions Cup quarter-finals due to the former's 19-10 win over Montpellier.
Leinster have a long list of injury concerns involving Ireland internationals and Luke McGrath has now been ruled out of the Six Nations.