Mandurah mustered arguably the biggest upset of the season at the best possible time as they conjured a crucial four-point win to send reigning back-to-back premiers Pinjarra tumbling out of the finals in straight sets on Sunday afternoon.
Just a week removed from their first finals win in almost a decade, the Mustangs found themselves repeating the feat as four goals from Alex McLeod and a dominant performance from Matthew Bennell led them into a preliminary final with a 9.11 (65) to 9.15 (69) win.
The shock result sees Pinjarra's season come to a close, with the once-premiership fancies exiting the 2019 finals campaign without a victory.
But it wasn't for lack of trying, as Riley Vidovich nailed a goal to cut the margin to just three points with only minutes remaining in the fourth quarter.
The Mustangs held on to the lead they'd built over the course of a brilliant third term though, claiming a monumental win that will go down in club history.
It was the hometown Tigers with the hot hand early on, however, as they nailed three goals to Mandurah's two to take the lead in the opening term.
Mackenzie O'Brien and Brett Milward were both in good form, and by half time Pinjarra held a 14-point lead thanks to a late goal from Jamie McNamara in the second.
But the third quarter belonged to the visitors.
Daniel Cransberg was fantastic in his duel against top Pinjarra forward Nic Merritt, as the defender helped his side limit the Tigers to a single goal in the term.
Meanwhile Bennell and Hamish Free got motoring around the ground, as Mandurah slotted four of their own goals to take a handy 10-point buffer into the fourth.
They were out to a 16-point lead when they jailed the first of the quarter, but Harley Divitini responded for the Tigers.
Pinjarra were within striking distance when Vidovich trimmed the lead to three points at the 22-minute mark, but the Mustangs stood firm to book their spot in the preliminary round.
It was a win built on belief, according to Mandurah coach George Costello, who was rapt with his side's determination.
"This is what happens when young players are just riding the crest of confidence," he said.
"Pinjarra was the only side we hadn't beaten all year, but we'd been close with them and the boys genuinely thought they could get the job done.
"It shows the mindset of this young group. They go into every game thinking they can win and they just don't any better.
"It's absolutely massive for our club to be playing a preliminary final."
That clash will see the Mustangs battling it out against Baldivis, who will be hoping to bounce back from their loss to Rockingham over the weekend.
The venue for the preliminary final games will be decided on Monday night.