ST MARY'S must step up against flying Clontarf
(all matches start Saturday 2.30 unless stated)
DIVISION 1A
St Mary's College v Clontarf, Templeville Road.
The home side will have to be at their best against the best attack and defence in the division. Coach Andy Wood could have Leinster A tight-head prop Tadhg Furlong on board in what is a full squad.
Lansdowne v Ballynahinch, The Aviva Stadium.
Ireland Clubs flanker Charlie Butterworth will be back to add strength and quality to the back row.
Old Belvedere v Young Munster, Anglesea Road.
Leinster A trio Leo Auva'a, Ben Marshall and Jack Conan are back to bolster The Black & Whites.
Dolphin v UCD, Musgrave Park, Sunday.
Leinster A wings Andy Boyle, possibly from full-back, and Sam Coghlan-Murray could give College real finishing power out wide.
DIVISION 1B
Terenure College v Dublin University, Lakelands Park.
Leaders 'Nure must not to drop into cruise mode to continue their unbeaten blitz for a 14th straight win. Dave Fanagan could come in anywhere along the Trinity three-quarter line on his way back from a broken leg.
Dungannon v Blackrock College, Stevenson Park.
Club captain Dave Rowan is replaced by Dave Scott-Lennon on the left wing in 'Rock's only change.
DIVISION 2A
Old Wesley v Naas, Donnybrook, Tonight 8.0.
Coach Morgan Lennon gives South African tight-head import Karl Bekker his first start of the season. Daragh O'Shea returns at full-back and Andy Kearney into the back row for Naas coach Niall Carson.
Bective Rangers v Banbridge, Donnybrook.
The Rangers have been steady rather than spectacular in maintaining their lower mid-table position.
NUIM Barnhall v Galwegians, Parsonstown.
Coach Dennis Bowes brings prop Peter Courtney and fly-half Chris Winks back to bolster his bench.
Seapoint v UCC, Kilbogget Park.
The Killiney club will be as close as possible to the side which dealt well with Bruff in the last round.
DIVISION 2B
DLSP v Skerries, Kirwan Park.
Salmo coach Phil de Barra will have to make a decision on the wing Martin Smyth and Tim Nugent. Skerries' unrelated half-backs Chris and Conal Keane went well against Tullamore and could be kept together.
Ards v Boyne, Hamilton Park.
Boyne just can't buy a win, losing their last four, their last two by just two points.
Midleton v Navan, Towns Park.
The Meath club has run into form, winning two and drawing one of their last three.
Nenagh Ormond v Greystones, New Ormond Park.
Coach Reggie Corrigan might stay with Killian Marmion at out-half given that Andrew Kealy is out with a broken leg.
Suttonians v Richmond, McDowell Grounds.
Coach Noel Hehir has picked the same side.
Tullamore v Sligo, Spollanstown.
Coach John Moylan might not make any changes for this one.