Preview: Pro12, Rearranged
Reigning champions, Glasgow Warriors, have a chance to claim some of their points in hand when Leinster are their opponents at Scotstoun. Warriors will be looking for league points to overtake their Scottish rivals Edinburgh, in the chase for qualification for the European Champions Cup next season, however Leinster are themselves looking for points in their challenge for a home playoff place in May.
On the same day, Munster travel to the Welsh capital to face Cardiff Blues knowing that victory could lift the visitors back into contention for a coveted playoff spot or, at the very least, aid their challenge for Champions Cup qualification.
The Munstermen will be keeping an eye on the results from Scotstoun, as Warriors are just four points behind them on the table.
We look at Friday's action!
Glasgow Warriors v Leinster
(Scotstoun Stadium, Kick-off: 19.35 GMT)
This Round Nine game was postponed from its original date in early December due to weather conditions.
Glasgow Warriors have lost just one of their last six fixtures - 10-13 away at Ulster on February 12. The Warriors solitary defeat at Scotstoun since September was 15-26 to Northampton in the European Champions Cup on November 21.
Leinster have lost just once since Round Four - 13-23 to Newport Gwent Dragons at Rodney Parade on January 29. The Leinstermen's only defeat to a Scottish opponent in their last five such encounters was 9-16 to Edinburgh at Meggetland in Round One this season.
Leinster won 23-18 at the RDS Arena in Round Five and have achieved a regular season's double over the Warriors only once since the 2005/06 season. Leinster's only previous victory at Scotstoun was 6-0 in November 2012 - that was also the only time that the Warriors have been kept scoreless at home.
Teams:
Glasgow Warriors: 15 Peter Murchie (captain), 14 Lee Jones, 13 Mark Bennett, 12 Sam Johnson, 11 Rory Hughes, 10 Rory Clegg, 9 Grayson Hart, 8 Adam Ashe, 7 Simone Favaro, 6 James Eddie, 5 Leone Nakarawa, 4 Greg Peterson, 3 Sila Puafisi, 2 Fraser Brown, 1 Gordon Reid.
Replacements: 16 James Malcolm, 17 Jerry Yanuyanutawa, 18 Zander Fagerson, 19 Scott Cummings, 20 Tyrone Holmes, 21 Ali Price, 22 Nick Grigg, 23 Glenn Bryce.
Leinster: 15 Zane Kirchner, 14 Isa Nacewa (captain) 13 Garry Ringrose, 12 Ben Te'o, 11 Dave Kearney, 10 Cathal Marsh, 9 Luke McGrath, 8 Jordi Murphy, 7 Dan Leavy, 6 Dominic Ryan, 5 Hayden Triggs, 4 Mick Kearney, 3 Tadhg Furlong, 2 James Tracy, 1 Peter Dooley.
Replacements: 16 Bryan Byrne, 17 Jeremy Loughman, 18 Michael Bent, 19 Ross Molony, 20 Peadar Timmins, 21 Isaac Boss, 22 Joey Carbery, 23 Noel Reid.
Referee: George Clancy (IRFU)
Assistant referees: Lloyd Linton, Mike Adamson (both SRU)
TMO: Jim Yuille (SRU)
Cardiff Blues v Munster
(Cardiff Arms Park, Kick-off: 19.15 GMT)
This game was one of the Round 12 fixtures moved to accommodate the rearranged European games.
Cardiff Blues' only victory in their last four fixtures was 23-13 at home to Ulster in Round 16. The Blues have lost just once at Cardiff Arms Park since November - 13-14 to Leinster on February 20.
Munster have won their last two matches at Treviso and at home to Newport Gwent Dragons and have been defeated just once, since the turn of the New Year, away from home in the competition - 24-27 to Glasgow in Kilmarnock on February 19.
Cardiff Blues' only victory in their last 11 encounters against Munster was 17-6 in Cork in January 2013. The Munstermen have not been defeated at Cardiff Arms Park since their visit in the Pro12 in May 2009.
Teams:
Cardiff Blues: 15 Dan Fish, 14 Aled Summerhill, 13 Garyn Smith, 12 Rey Lee-Lo, 11 Blaine Scully, 10 Rhys Patchell, 9 Lloyd Williams, 8 Josh Navidi, 7 Ellis Jenkins, 6 Macauley Cook, 5 Josh Turnbull, 4 Cam Dolan, 3 Salesi Ma'afu, 2 Matthew Rees (captain), 1 Brad Thyer.
Replacements: 16 Kristian Dacey, 17 Thomas Davies, 18 Taufa'ao Filise, 19 Lou Reed, 20 Manoa Vosawai, 21 Lewis Jones, 22 Jarrod Evans, 23 Gavin Evans.
Munster: 15 Andrew Conway, 14 Darren Sweetnam, 13 Francis Saili, 12 Rory Scannell, 11 Ronan O'Mahony, 10 Ian Keatley, 9 Duncan Williams, 8 Robin Copeland, 7 Dave O'Callaghan, 6 Jack O'Donoghue, 5 Billy Holland (captain), 4 Dave Foley, 3 John Ryan, 2 Mike Sherry, 1 James Cronin.
Replacements: 16 Niall Scannell, 17 Dave Kilcoyne, 18 Stephen Archer, 19 Sean McCarthy, 20 Jordan Coghlan, 21 Cathal Sheridan, 22 Johnny Holland, 23 David Johnston.
Referee: David Wilkinson (IRFU)
Assistant referees: Ian Davies, Gwyn Morris (both WRU)