Captain Travis Head is the main obstacle between Western Australia and a crucial Sheffield Shield win at the WACA Ground.
South Australia ended the third day at 5-135 chasing 274 for victory with Head not out 61 and wicket-keeper batsman Alex Carey on nine.
The Redbacks are also a batsman short with Nick Benton dislocating his shoulder in the field on day one.
WA began the final day at 2-31 then collapsed to be 8-88 at lunch, holding a middling lead of just 169 runs.
But 89 from captain Adam Voges with support from debutant Josh Nicholas (41) got the home side to 192, setting South Australia 274 to win.
Redbacks pacemen Joe Mennie (3-47), Daniel Worrall (3-48) and Chadd Sayers (3-76) were terrific.
South Australia then struggled to put together meaningful partnerships with the bat, losing Jake Weatherald for his second duck of the match.
Mark Cosgrove was out for 31, Sam Raphael for 16, Jake Lehmann for six and Alex Ross for two.
Head appears to hold most of the visitors' hopes, his stylish 61 including 11 boundaries.
Joel Paris has 3-31 for WA.
The winner of the match will remain an outside chance of qualifying for the Shield final while the loser is out of the running.
The Warriors play Queensland at the Gabba in the final round with the Redbacks facing bottom placed Tasmania at Glenelg.
Paceman Worrall is backing Head to get the Redbacks home and will do his best if called upon.
"We're there to do a job and hopefully we don't have to make too many in the lower order, but if we have to we'll do our best to get it done," Worrall said.
"He is one that prides himself on playing and performing well in big games. We saw that through the Big Bash, we've seen it in the Matador Cup and we have every faith in him to do the job."
Worrall backed up his 5-91 from the first innings and the 24-year-old was proud of the bowling unit without Benton.
"He's seen better days the poor fella. He's still been around the group and he's tried to hide his emotions and still be his chirpy self, but I can't see him playing too much of a role," Worrall said.
"We came out with the attitude that our season hinged on how we performed. Without Benton it was hard work but we restricted them before the last couple of partnerships. We thought we'd done enough to warrant a good chase."
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