Queensland 3 for 143 (Reardon 55*, Burns 51) trail South Australia 387 (Cooper 171, Botha 61, Feldman 5-101) by 244 runs
After resuming on 4 for 294, with Tom Cooper's overnight 165, South Australia looked set to make an imposing first-innings total, but a five-wicket effort from Queensland seamer Luke Feldman put paid to that and six wickets fell for 93 runs.
After just five overs in the morning session, Johan Botha, who had made 61, was trapped in front by Feldman to set off the South Australia slide. Cooper's innings came to an end a few overs later, when he was caught behind by the wicketkeeper Peter Forrest for 171. South Australia were eventually dismissed for 387 in 131 overs.
The Queensland openers began with a 48-run stand, before Greg Moller was caught by Michael Klinger at slip off the bowling of Johan Botha for 26. Usman Khawaya, who had an outstanding Ryobi One Day Cup campaign with 426 runs at 71, including four fifties and one hundred, was unable to continue his good form as he was out for just 8 off 43 balls, with Botha again the successful bowler.
New batsman Joe Burns, along with Nathan Reardon, fashioned a 71-run partnership for the third wicket, before Botha struck for the third time with about half an hour before stumps, leaving Queensland on 3 for 143.