A thrashing of Lyon ensured Leinster made it five wins from five in the European Champions Cup, while Racing 92 reached the last eight.
Rhys Carre's early red card made life difficult for Saracens, but they still defeated Ospreys in the European Champions Cup.
La Rochelle kept their hopes of progressing in the European Champions Cup alive by beating Sale Sharks, while Harlequins edged out Bath.
Lyon are reportedly targeting Ireland fly-half Johnny Sexton, but Leinster insist there has been no suggestion he will leave the province.
Brothers Joe and Sam Simmonds were influential as Exeter Chiefs moved to the brink of a quarter-final spot in Europe.
Saracens claim a derogatory comment made to Jamie George by Munster's chief medic sparked a fracas at Allianz Park.
Brothers Billy and Mako Vunipola played starring roles as reigning champions Saracens defeated Munster in the European Champions Cup.
Juan Imhoff scored two of Racing 92's six tries as they beat Ospreys 40-27 to increase their lead at the top of Pool 4.
Leinster head coach Leo Cullen is unsure how long fly-half Johnny Sexton will be out of action.
Exeter Chiefs were made to work hard for their third European Champions Cup win in a row, with Rob Baxter relieved to get over the line.