Half centuries from Gareth Delany and Matt Ford led Munster Reds to an emphatic six wicket win against the North West Warriors at Comber.
It means the final day will feature a winner takes all clash between defending champions Leinster Lightning and the Warriors on Sunday afternoon.
After the morning game between Northern Knights and Leinster Lightning was abandoned without a ball bowled, the toss was likely to prove crucial in tough conditions and so it proved as the Warriors were in early trouble.
Gareth Delany: Pic by Oisin Keniry
Wickets for Matt Ford, Josh Manley, Mike Frost and Fionn Hand had Gary Wilson's side in trouble at 39 for 4 approaching the halfway stage, and when Stephen Doheny fell for 27, they were 66 for 5 with just seven overs remaining.
Graham Hume's aggressive 52 from just 24 balls (3 fours, 4 sixes) gave his side something to defend, as he and Graham Kennedy (30*) plundered 83 from just 40 balls as the Warriors posted 151 for 6.
When PJ Moor and Murray Commins both fell cheaply to Hume and Conor Olphert, the Warriors would have been cock-a-hoop, their joy was short lived as Munster's boundary blitz soon ate into the target.
Delany looked back to his best after his knee surgery, as he smashed 6 fours and 3 sixes in his 60 from just 35 balls, adding 78 in 46 balls with Matt Ford.
Matt Ford: Pic by Oisin Keniry
His dismissal saw Ford take up the mantle, and his unbeaten 67 from 37 balls (9 fours, 2 sixes) saw him pip Delany and Hume to the Man-of-the-Match award as Munster clinched the six wickets win with 29 balls to spare.
At Comber, Munster Reds beat NW Warriors by six wickets
NW Warriors 151/6 (20 overs; G Hume 52, G Kennedy 30, S Doheny 27; M Ford 2-25, J Manley 2-38)
Munster Reds 152/4 (15.1 overs; M Ford 63*, G Delany 60; C Olphert 2-26, G Hume 2-30)