Saturday's prelim between North Whyalla and Roopena was set to be a blockbuster with the winner to go through to face Centrals in the grand final.
Roopena's captain won the toss and elected to bowl in the hopes of replicating the previous week's performance.
Veterans Quist and Lewis opening up for North to take on Whyalla News Medallist Van Eekeran and Dunbar.
As he has done all year Van Eekeran got the key early break through of Quist.
Mudalige joined Lewis and the runs continued to tick over before the spin sensation of Chenoweth dismissed both in quick succession in a patch that saw North lose 4-40 to be left reeling at 5-97.
With the prelim final slipping away from North, skipper Miller joined Atkinson in perhaps his best performance in Whyalla with the bat notching a valuable unbeaten half century with Atkinson returning to some form with 34.
North's innings finishing at 6/182 a more than competitive total.
With the early call to send North in possibly weighing on Chenoweth's mind, he sprung a surprise move in sending late inclusion Tudhope to join Dunbar opening the batting.
The move worked with the pair starting well, before Tudhope fell first víctim with the score on 37.
This brought Roopena's two best batsmen together with both holding the key for victory.
The pair were more than up to the task with Dunbar in a much more subdued role and Fiebig anchoring as always pushed the score to 95 before in the space of a few overs Roos found themselves in a less than relaxed state as Miller continued his day out reducing Roos to 4-116.
When Martin fell at 5-140 the game was their for either side to take.
Lucky for Roos the cool head of Johns joined Fiebig in remaining unbeaten to see Roos through to their first grand final in four Years.