(all Saturday 2.30 unless stated).
Lansdowne v St Mary's College, The Aviva Stadium, 4.0
Mike Ruddock's men have built up an unassailable 14-point lead over Clontarf with five rounds left for discussion. Tight-head prop Martin Moore should be back from Leinster 'A' duty. St Mary's coach Hugh Hogan is operating in the relative comfort zone of mid-division. One more win should see them safe. They are not likely to find it here.
Old Belvedere v Garryowen, Anglesea Road
Captain Johnny Slattery is coming back from injury and Ireland Clubs prop Pat O'Regan is available as second-from-bottom Belvo' look to move away from a precarious situation with one club for the drop and another earmarked for a relegation play-off.
UL-Bohemian v Clontarf, Thomond Park, 1.0
The chase is a forlorn one for 'Tarf as coach Andy Wood has to figure out how to keep his men motivated to keep a firm grip on second place.
Belfast Harlequins v Dublin University, Deramore Park
Centre Conor Kearns will start in place of Ciaran Wade, who has been ruled out with concussion as Trinity, in third, trail UCD by a single point.
Blackrock College v Bruff, Stradbrook
Job Langbroek will come back into the side at number eight and Jamie Glynn will start at scrum-half for coach Ben Manion.
UCD v Buccaneers, Belfield.
College director of rugby Bobby Byrne knows that Ballynahinch are too far ahead to be caught unless they fall apart. There is still a shot at promotion against the second last club in 1A as long as they can bury the Buccs.