Western Australia 355 (Inglis 86, Cartwright 83, Turner 79, Worrall 5-72) and 7 for 370 dec (Cartwright 111*, Agar 86, Short 66, Winter 4-90) beat South Australia 201 (McInerney 51, Guthrie 4-59) and 243 (Ferguson 92, Weatherald 62, Agar 3-41, Paris 3-52) by 241 runs
A lower-order collapse from South Australia has handed Western Australia victory in the final Sheffield Shield match of the home-and-away season.
The Redbacks, 1 for 7 overnight, were tasked with batting out the final day for a draw after the Warriors had set the impossible target of 525 to win.
Unperturbed, Ferguson found another capable ally in Travis Head and the pair reached the 60-over mark comfortably. But Head's dismissal, caught and bowled by Ashton Agar for 47, triggered the Redbacks demise.
Jake Lehmann and Alex Ross both fell cheaply before left-arm quick Joel Paris found Ferguson's outside edge on 92 with a ball that angled in and shaped away from round the wicket.
That left Alex Carey and tail nearly 30 overs to survive. Carey lasted just under 13 more overs at the crease before he fell to a top edge attempting a sweep off Agar.
The last three also fell to spin in the fading light. Nick Winter edged D'Arcy Short to second slip while defending with five men around the bat. Daniel Worrall played a bizarre slog-sweep moments later only to meekly pop up a top edge to slip to end the match.
Agar and Paris both finished with three wickets while Hilton Cartwright was named man of the match for his scores of 83 and 111 not out.