"We've had some close games with Munster," says Scarlets coach Nigel Davies, "but the one thing they do is carry a lot of experience and in key moments they tend to make the right decisions because of that experience."
The experience Davies refers to will be provided tonight by the likes Paul Warwick whose 10th minute stoppage time penalty from half way gave Munster a 24-23 victory in Stradey in 2008, Peter Stringer, now Munster's most capped player, Marcus Horan, Mick O'Driscoll and captain Denis Leamy.
And their leadership will be vital as coach Tony McGahan gives youth in the shape of Simon Zebo, Danny Barnes, Declan Cusack, Mick Sherry, Stephen Archer, and from the bench Scott Deasy and Paddy Butler, its fling.
For their part Scarlets will be without influential centre Jonathan Davies and prop Deacon Manu but on the plus side there's young wing sensation George North, the gifted Regan King and Scot Sean Lamont who will ask serious questions of the Munster defence.
Home advantage the theirs being much the greater need make Scarlets the favourites to edge what should be another enthralling and nerve jangling encounter that will go right down to the wire.
Scarlets: M Stoddart; G North, R King, G Maule, S Lamont; R Priestland, T Knoyle; I Thomas, M Rees (capt), R Thomas; L Reed, J Turnbull; R McCusker, J Edwards, D Lyons. Replacements: E Phillips, R Jones, S Gardiner, A Shingler, D Welch, G Davies, S Jones, S Williams.
Munster: P Warwick; S Zebo, J Murphy, L Mafi, D Barnes; D Cusack, P Stringer; M Horan, M Sherry, S Archer; D Ryan, M O'Driscoll; T O'Donnell, N Ronan, D Leamy (capt). Replacements: D Fogarty, D Hurley, J Hayes, A Quinlan, P Butler, D Williams, S Tuitupou, S Deasy.
Referee: Alan Lewis (Ireland).