A single point win away to 'Wegians was enough to put Shannon three points clear of last season's rivals but it is neighbours UL Bohemians who are at the top of Division 1 of the AIB League.
UL Bohs have 14 points following their home win over last season's playoff finalists Clontarf.
Newly promoted Dolphin beat Blackrock to make the top five an all Munster affair with three Limerick and two Cork clubs.
St. Mary's College moved up the table with their second win but opponents Garryowen still garnered a bonus point at Templeville Road.
Our feature diary keeper from Division 1 - Richie Mandeno's UCD drew 20 - 20 with Dublin neighbours Lansdowne. Mixed fortunes for the Ulster Clubs as Dungannon beat 'Con but Ballymena and Belfast Harlequins lost to 'Nure and Buccs respectively.
AIB League Division 1 Table - Click Here
In division two of the AIB League out other diarist Dave Walsh's Suttonians lost 18 - 3 in a repeat of last season's Division 3 playoff final.
Greystones beat Barnhall 7 - 5 to stay out on top, while Old Crescent's 21 - 9 win over Dublin University sees them in second, just ahead of Clon.
Belvo picked up their second win away to Co. Carlow, while Midleton beat Malone and Bective lost away to DLSP.
AIB League Division 2 Table - Click Here
The Hinch sit proudly atop Division 3 with three wins from three and two bonus points to give them a four point lead over Inst and Wanderers, who both racked up impressive wins over City of Derry and Old Wesley in Ulster and Leinster derbies.
Waterpark lost at home 11 - 17 to Nenagh Ormond, while Queens went down by the same score to Ards. Corinthians and Babridge scored impressive wins over the 'Well and Connemara, while Bruff racked up a 29 - 11 win away to Portadown.
The top three sides all scored over 40 points, with Ballynahinch's 45 - 13 over Rainey and Wanderer's 45 - 13 against Old Wesley being slightly eclipsed by Instonian's 54 to Nil drubbing of City of Derry.
AIB League Division 3 Table - Click Here