The pressure is building behind a full-strength St Mary's as usual suspects Cork Con and Shannon gather for a charge to the top.
Clontarf v UL-Bohemian, Castle Avenue
'Tarf can still soar into contention, but they cannot afford many more slip-ups. Tight-head Ben Barclay's solid form for the seconds has won him a starting berth.
Cork Constitution v Blackrock College, Temple Hill
'Rock have slumped to four straight losses. They will have to arrest the slide at Con' with Kyle Tonetti over a hand injury.
Old Belvedere v Young Munster, Anglesea Road
This will go a long way towards deciding the eventual winners of the Division as first meet second. Belvo out-half Andrew Dunne has recovered from injury.
UCD v Lansdowne, Belfield
The Students are beginning to get their act together with the Ruddock brothers, Rhys and Ciaran, making an impression in their forward pack. The Lansdowne juggernaut, driven by coach Willie Clancy, shows no sign of stalling as the unchanged leaders travel across the dual carriageway in search of their eighth straight win.
DLSP v Bective Rangers, Kirwan Park
'Salmo have promotion on their minds, lying in second. Tight-head Keith Taite could make his first appearance for a year.
Rangers are still in the hunt for promotion, five points behind DLSP. Flanker Mark Hennelly and prop Mark Harpur are fit again.
Dublin University v Old Crescent, College Park
Trinity director of rugby Tony Smeeth will want his players to improve. Paddy McCabe is a possibility for loose-head.
Greystones v Clonakilty, Dr Hickey Park
Relegation-threatened 'Stones are desperate to secure their second win of the campaign.
Highfield v Terenure College, Woodleigh Park
Ian Morgan's 'Nure can welcome back lock Brian Moroney and flanker Kevin O'Dwyer to bolster their pack.
Old Wesley v Belfast Harlequins, Donnybrook
Wesley complete the set of three Leinster clubs at the head of the Division. Lineout specialist Marc Warburton returns.
Wanderers v Midleton, Merrion Road
Wanderers would have found it hard to believe that they would win six of seven and still find themselves in fourth position. Centre Peter Burke could be in line for his first start of the season.
Barnhall v Portadown, Parsonstown
The Leixlip club can do some of their Leinster counterparts a favour by clipping the All Blacks in Clifden. Scrum-half Philip Caldwell, hooker Padraic Beatty and lock Greg Boland are selected.
Suttonians v Connemara, McDowell Park
The northsiders will aim to maintain their 100pc home record with the Kearney brothers, Frank and Aidan, united in this goal.
Ards v County Carlow, Hamilton Park
Carlow are running out of chances to move away from danger. Prop Padraig Brennan, wing Emlyn Lynch and No8 Sean Hennessy move into the side.
Rainey Old Boys v Navan, Hatrick Park
Navan player-coach Brad Harris will emphasise the importance of not getting dragged into the basement battle. He will go with the same side again.
Nenagh Ormond v Naas, New Ormond Park
Coach Andy Wood must make a decision at centre where three into two won't go between Leigh Gough, Emmet Harney and Johnny Sheahan.