Nenagh Ormond, who started the day in 4th place, defeated Queens 38-25 in Belfast.
They scored six tries – Derek Corcoran (2), Lemeki Vaipulu, Fergal Brislane, Mike Fogarty and Peter O'Connor all crossed the line for the victors.
Cashel beat Skerries 31-14 at Spafield.
They trailed by two points at the break but a strong second-half showing earned them the victory over the Dublin side.
Ed Leamy scored two tries for Cashel, Kevin Leamy and Danny Lambe one each as well as being awarded a penalty try.
Pat O'Connor kicked three conversions.
