IT could be a case of 'who blinks first' under the Friday night lights.
St Mary's College v Lansdowne, Templeville Road, Tonight 7.30: The holders are adjusting to a new regime, led by former number eight Hugh Hogan. Coach Mike Ruddock could have the Leinster front row of Jack O'Connell, Tom Sexton and Martin Moore back on board for a battle royale.
Clontarf v UL-Bohemian, Castle Avenue: Leinster have made Noel Reid available to 'Tarf. Prop Royce Burke-Flynn is flying after a professional stint at Doncaster.
Garryowen v Old Belvedere, Dooradoyle: The Black and Whites have made a poor start, losing two from two, to languish near the bottom, saved only by two losing bonus-points.
Dublin University v Ballymena, College Park: Director of rugby Tony Smeeth finally has all his players fit and ready. There is a choice between David Joyce and Cathal Marsh at fly-half.
UCD v Ballynahinch, Belfield: Rob Shanley is likely to come in for Leinster's Luke McGrath in a half-back partnership with James Thornton.
Belfast Harlequins v Blackrock College, Deramore Park: Coach Ben Manion has to find a way to generate some sort of momentum as 'Rock sit last. They may get a chance to turn it around against another winless club.
Bective Rangers v DLSP, Donnybrook, Friday 7.30: Rangers are on the slide already at third-from-bottom. They badly need a win against the only club yet to register a single point. Coach David Murphy welcomes back Conor Power into the centre and the unavailability of lock Eoin Burke opens the door for Alan Costigan.
City of Derry v Old Wesley, Judge's Road: Wes' are one of eight clubs who have won one, lost one. Derry are in the same position. Home-town advantage could be key.
Greystones v Galwegians, Dr Hickey Park: The return from injury of tight-head prop Ronan Kearney allows Bobby Clancy to move to loose-head. Roddy Carroll comes into scrum-half.
Midleton v Seapoint, Towns Park: Ken Casey moves into the centre with Chris O'Brien at full-back and Marty Kearns has been inserted at openside.
Terenure College v Queen's University, Lakelands Park: 'Nure are not waiting to make their customary end-of-season charge. They have a +40 points difference and mean business this season.
Navan v Boyne, Balreask Old, Tonight 8.0: Coach Leon Jordaan has opted for Alan Hickey as his third out-half of the season with the previous occupant Brian Farrell shifting to nine to cover an injury there. Second row Dermot O'Neill is back from injury to sit on the bench in what is the same selection again.
NUIM Barnhall v Ards, Parsonstown: Former Ireland U20 second row Conor McDermott is back from suspension to bolster the engine room.
Skerries v Naas, Holmpatrick: The home side are in break-even territory with one win and one reverse. Half-backs Dave Hewitt and Chris Keane are quality at this level. Naas coach Niall Carson has gone for an unchanged selection
Suttonians v Clonakilty, McDowell Grounds: Paul Proctor will start at number eight, Daire Higgins in the centre and Richard Kelly at hooker in three alterations.