DIVISION 1A - Dolphin v St Mary's College, Musgrave Park: The holders will want to get a move on if they are to make a defiant defence of their title. They are nine points off the lead and three off fourth place.
Lansdowne v Cork Constitution, The Aviva Stadium: Mike Ruddock's side lead the league as one of only two clubs to hold a 100pc return on their three-game investment. Full-back and captain Ross McCarron is fit.
Old Belvedere v Shannon, Anglesea Road: The 2011 champions OB will duel it out with the nine-time winners in what is a battle of the bottom two clubs. Andrew Dunne should have Leinster 'A' lock Ben Marshall in the mix.
Young Munster v Clontarf, Tom Clifford Park: Andy Wood's 'Tarf finally got their act together against UL-Bohs. Fly-half Darragh Fitzpatrick has recovered from injury.
Blackrock College v Ballynahinch, Stradbrook: Coach Ben Manion has decided to go with the same side that ran Harlequins quite close last week.
Bruff v Dublin University, Kilballyowen Park: Trinity are one of three clubs with three out of three wins. Director of rugby Tony Smeeth will have David Joyce at fly-half.
Malone v UCD, Gibson Park: Director of rugby Bobby Byrne will add the reliable Danny Kenny to his back-row options.
Seapoint v Terenure College, Kilbogget Park (Tonight 7.30): The home side will look to build on their away win at Midleton, bringing Hugh Kelliher in at flanker and Anthony Quinn at nine. Number eight Alex Dunlop, props Johnny Barretto and Paul Collins and centre John Bollard all have to come through fitness tests.
Cashel v Greystones, Spafield: Former Wicklow Gaelic goalie Billy Norman could be in line for an appearance in the second row of coach Reggie Corrigan's team.
DLSP v Highfield, Kirwan Park: Coach David Murphy will have to deal with the loss of a quartet of players, three forwards and one back in what will be a much-changed side.
Old Wesley v Galwegians, Donnybrook: Coach Morgan Lennon may debut former Pontypridd prop Kenny Knaggs in a bid to add bulk to the pack.
UCC v Bective Rangers, The Mardyke: Rangers have just one club under them as they attempt to snatch their first win of the season at a club looking for their third.
Naas v Navan, Forenaughts (Tonight 7.30): This is a tasty one as second hosts first. Player-coach Niall Carson moves into the back row, Jock Toland coming into the middle of the front row. Navan prop Eoin King and lock Dave Sheridan are out. Loose-head Darren McDonagh and flanker Shane Dawson are part of the reshuffle.
Boyne v Suttonians, Shamrock Lodge: The home side came up just short (18-13) against current leaders Navan last week. They are three points away from the top spot. Centre Alan Dodd, lock Thomas Keane and flanker Glen Predy are the three changes for the visitors from last week.
Rainey Old Boys v NUIM Barnhall, Hatrick Park: Coach Denis Bowes will surely stick close to the side that has hammered Ards (42-7) and Thomond (40-14) in the last two rounds with Rob Holt and Ben McCarthy at half-back.
Thomond v Skerries, Fitzgerald Park: The unrelated Chris and Conal Keane, at half-back, came within three points of downing unbeaten Naas last time out. There shouldn't be too many changes.