Second Test, Gqeberha (day five of five)
South Africa 425-9 dec: Bavuma 179, Jansen 85; Boland 5-81
Australia 99 & 295: Head 121; Rabada 4-77, Mulder 3-64
South Africa won by an innings and 31 runs
South Africa broke Australia's resistance in the final session to complete a famous victory in the second Test and set up a series decider in Cape Town.
Travis Head made 121 for Australia and Scott Boland survived 166 deliveries for 40 runs in an attempt to escape Gqeberha with a draw - the tourists' hopes also boosted by the first session being wiped out by rain.
But the Proteas stuck to their task to take the six wickets needed to win by an innings and 31 runs as the light faded late on the last day.
Premier paceman Kagiso Rabada finished with 4-77 while Marco Jansen, whose 5-33 on day four put South Africa in the ascendancy, took the final wicket as Australia were dismissed for 295.
But all-rounder Wiaan Mulder also played a crucial hand, bowling with accuracy and finding movement off the pitch to dismiss Head, Boland and Australia captain Pat Cummins.
Some of South Africa's great Test wins have come against Australia - notably in the last World Test Championship final two years ago and a Test on this ground in 2018 in the infamous Sandpaper series. This must surely rank highly among them.
They were heavily beaten in the first Test in Durban and when 40-4 and 110-6 in their first innings of this Test, there appeared only one winner in this series.
Instead, the contest has been turned on its head by Bavuma's epic 179 and South Africa twice dismissing Australia, setting up a tantalising finale in Cape Town.
The third Test begins on Tuesday.