Young Munster defeated defending champions Clontarf to join Lansdowne at the top of Division 1A, while Terenure College lifted themselves off the bottom of the table after an eight-try thriller with UCD.
Lansdowne's lead at the top of Ulster Bank League Division 1A has been cut to one point after Old Belvedere ended the headquarters club's winning run, while Dublin University took the spoils at Templeville Road in a game that was streamed live on the Irish Rugby Facebook page.
Round 3 of Ulster Bank League Division 2A begins with a floodlit Belfast derby between Queen's and Malone, while leaders Nenagh Ormond and Blackrock College - both with 100% records so far - are on their travels on Saturday.
Division 1B leaders UL Bohemians continued their excellent start to the new season by defeating one of the main rivals for promotion, Ballynahinch, in a very entertaining nine-try clash in Limerick today.
There are some brilliant match-ups again in Division 1A of the Ulster Bank League this Saturday, with three Dublin derbies in the capital and Cork Constitution and Young Munster clashing in a repeat of last April's semi-final.
The top four teams from the opening round will meet in Ulster Bank League Division 1B this weekend, as newcomers Naas make the trip north to Ballymena and it will be first plays second when UL Bohemians host Ballynahinch on the University's 4G pitch.