Australia's second Test against South Africa spiralled toward crisis on day four in Gqeberha, with Pat Cummins' side bowled out for just 99 in their first innings, forced to follow on, and then stumbling to 4-156 at stumps, still trailing the hosts by 170 runs. The result leaves Australia fighting to save the match and protect their 1-0 series lead ahead of next week's decider in Cape Town.

A former South African great labelled the tourists "gutless" as the fallout from one of the most humiliating collapses in recent Australian cricket history began to take shape.

A Historic Low: Australia Forced to Follow On

The follow-on is only the third time Australia have been sent back in since 1988, a statistical rarity that underlines the gravity of the situation. The first-innings capitulation was largely the work of South Africa's Marco Jansen, who finished with a devastating 5-33 to dismantle the Australian batting order inside a single session.

The collapse is all the more remarkable given Australia had South Africa reeling at 6-110 early on the third morning of a rain-affected match, before the hosts recovered to an imposing 9 declared for 425. That turnaround set the scene for Wednesday's carnage.

Travis Head has provided the sole source of resistance in Australia's second innings, finishing the day unbeaten on 87, with nightwatchman Scott Boland surviving alongside him at the close. Head's knock offered a rare bright spot in an otherwise bleak day for the visitors.

Complicating Australia's path to survival further, Steve Smith is battling a stiff neck and was unable to bat in the second innings on Thursday after struggling through 28 runs in the first. His absence removes one of Australia's most reliable big-match performers at precisely the wrong moment.

Maddinson, Labuschagne and Webster All Under Scrutiny

The most intense scrutiny is falling on three batters whose places in the side now appear increasingly precarious: Nic Maddinson, Marnus Labuschagne and Beau Webster.

Maddinson's recall to Test cricket has been a near-unmitigated disaster. After falling for a fourth-ball duck caught driving late on day three off Kagiso Rabada, he was dismissed again on Wednesday, edging the same bowler for just eight. His four scores since being recalled read 0, 48, 0 and 8, and his career Test average of 10.71 is the second lowest of any top-six Australian batter in history. His axing for Cape Town appears all but certain.

Labuschagne's situation is almost equally fraught. The Queenslander has not scored a Test century since the 2023 Ashes, and his recent sequence of scores, 4, 37, 37, 14 and 39, has done little to address the concerns raised by coach Andrew McDonald just two months ago, when McDonald declared Labuschagne "needs some big runs."

In his second innings on Wednesday, Labuschagne survived a nervy moment when an lbw review was overturned on 36, with ball-tracking showing the ball would have missed the stumps by just 4.7 millimetres. But he squandered the reprieve three runs later, driving spinner Simon Harmer into a heavy wind and being caught well short of the boundary, leaving himself admonishing his own shot selection as he trudged off.

Webster, meanwhile, managed only 13 in the first innings before falling lbw for eight in the second, his place in the XI also looking uncertain heading into the series finale.

What Comes Next: Selection Options for Cape Town

Australia have several batting options available should the selectors decide to make changes for Cape Town. Josh Inglis, Cooper Connolly and Sam Harper are all touring as reserve batters, while allrounder Cameron Green is edging closer to recovering from an abdomen strain.

Additionally, Sam Konstas pushed his case with a Sheffield Shield century in Perth on Wednesday, with Nathan McSweeney and Kurtis Patterson also available as potential options if the selectors opt for a major reshuffle.

With one day remaining in Gqeberha and Australia still 170 behind with six second-innings wickets intact, a series-levelling defeat for the tourists remains a very real possibility.