Tarf must aim high at home to Garryowen
(Matches Tomorrow, 2.30, unless stated)
Clontarf v Garryowen, Castle Avenue
There are still three rounds left to play in the top tier. 'Tarf lead on points difference. Simon Crawford could be back in contention for what is more likely to be the same side.
Cork Constitution v St Mary's College,
This is a nasty one for St Mary's. Con' trail YM by five points for third. They have to win where it is not the done thing.
Blackrock College v Dolphin, Stradbrook
'Rock are in dire trouble. They have lost their last four by big margins, working out at 30 points on average.
Lansdowne v Young Munster, Aviva Stadium
The topsy-turvy nature of this division can be gauged by Lansdowne's home loss to St Mary's and away win at Dolphin in the last two rounds. Ireland U20 wing Foster Horan will be back.
Old Belvedere v Shannon, Anglesea Road
The champions won for the first time in Garryowen. Could they pull off a miracle escape? Ireland U20 Jack Conan and Leinster's Leo Auva'a are expected back.
UCD v Ballynahinch, Belfield Bowl
College need to overtake Bruff, who are four points ahead, or they will be relegated. Michael Twomey is due to return at full-back.
Seapoint v Dublin University, Kilbogget Park, Tonight, 7.30
You could forgive Tony Smeeth's unchanged champions for celebrating tonight given they lead the table by 12 points with two rounds left. The home side will have Ken Casey at fly-half and Chris O'Brien in at full-back. They stand one point out of the play-offs and three out of second place.
Old Wesley v Greystones, Donnybrook, Tonight 7.30
Coach Morgan Lennon promotes centre Eoin Fitzpatrick to first-team action. Roddy Carroll comes in at scrum-half for Dermot O'Rourke for 'Stones.
Terenure College v Instonians, Lakelands Park
'Nure are in lower mid-table limbo, going for their seventh win against relegation threatened Inst'.
Bective Rangers v Clonakilty, Donnybrook
Johnny McMahon returns from abroad to contest a spot along the three-quarter line.
Old Crescent v DLSP, Rosbrien
Slamo' coach David Murphy will have to do without fly-half Phil de Barra. Backs Ken Copeland and Adam Philpott are in a race to prove their fitness.
NUIM Barnhall v Sligo, Parsonstown
Barnhall coach Denis Bowes has opted for the same side.
Suttonians v Connemara, McDowell Grounds
Lock Aidan Kearney and wing David O'Neill are the two changes in personnel.
Wanderers v Cashel, Aviva Stadium
Coach Greg Lynch could go with the same side that forged a second win of the campaign last week.
Ards v Boyne, Hamilton Park
The Meath club are nicely consolidated in ninth and motivation could make the difference for bottom club Ards.
Nenagh Ormond v Naas, New Ormond Park
Coach Niall Carson brings in new half-backs in Joey Moran and Mick Barton.
Rainey Old Boys v Navan, Hatrick Park
Out-half Brian Forristal is back at the controls.