South Australia coach Darren Berry has declared Wednesday's table-topping one-day clash with in-form Victoria at the MCG a virtual qualifying final.
Reigning domestic one-day champions SA enter the day-night fixture on a three-game winning streak and in second spot.
But Berry admitted the form of the top-placed Bushrangers - who have amassed three bonus points and three totals of 348 or more in winning their past four games - was extraordinary.
"The Victorian form this year has been unbelievable, watching it from afar," Berry said.
Bushrangers opener Aaron Finch and middle-order batsmen David Hussey have been in particularly rare touch.
Finch smashed 140 and Hussey an unbeaten 140 from 84 balls as Victoria made ridiculously light work of a NSW target of 350 in their most recent match, getting there with six wickets and 20 balls to spare.
Hussey's only other innings for the series so far was a similarly-quick century against Tasmania, while Finch belted 154 in an earlier annihilation of Queensland and is averaging 112.75 this season at better than a run per ball.
"Finch has been in extraordinary form. I'm assuming Rob Quiney might come back," Berry said.
"They're a really good one-day side.
"Whoever wins this one can probably almost pencil in a final with only two or three to play after the break. Wednesday night is a big game."
Victoria, five points clear of the Redbacks, will have two matches to come after Wednesday's clash and SA three.
Victoria coach Simon Helmot said SA, fresh from handing Victoria a Sheffield Shield thrashing, remained a benchmark side in the one-day format, with good bowling variety and Phil Hughes second only to Finch in the competition run tally.
Helmot said the Bushrangers wanted to bounce back from their Shield performance and also give themselves a buffer at the top of the table.
The Bushrangers named Quiney, dropped from the Test side after a pair in Adelaide, in their 13-man squad but have lost allrounder John Hastings to international duty.
Hard-hitting allrounder Dan Christian returns for SA, after missing the Shield win for disciplinary reasons.
Victoria squad: Cameron White (capt), Scott Boland, Aaron Finch, Peter Handscomb, Jayde Herrick, David Hussey, Alex Keath, Glenn Maxwell, Darren Pattinson, Rob Quiney, Chris Rogers, Clive Rose, Will Sheridan.
SA squad: Johan Botha (capt), Dan Christian, Tom Cooper, Theo Doropoulos, Callum Ferguson, Jake Haberfield, Phil Hughes, Michael Klinger, Tim Ludeman, Gary Putland, Kane Richardson, Alex Ross, Daniel Worrall.