Leinster player ratings: After a slow start, Leinster simply blew Harlequins away at Croke Park, recording a frankly embarrassing 62-0 hammering for the ages.
Leaders Bath maintained their imperious form in the Gallagher Premiership with a 47-28 victory over Harlequins in front of another sell-out crowd at the Recreation Ground.
England lock Ollie Chessum will return to Leicester Tigers' starting XV on Sunday as his side host Saracens in the Gallagher Premiership.
Harlequins defied the absence of their England stars to stun Saracens 23-12 after coming alive in the second half of their Gallagher Premiership clash at Tottenham Hotspur Stadium.
England captain Maro Itoje will return to captain a Saracens side containing four of his international team-mates during the Guinness Six Nations when they host Harlequins in the Gallagher Premiership on Saturday.