Third Test, Cape Town (day one, close):
Australia 209 v South Africa 57-0
Coverage: Live on Sky Sports, live scorecard on BBC Sport website
Steyn was in great form in Cape Town
Four wickets from paceman Dale Steyn helped South Africa dismiss Australia for 209 on the first day of the third and final Test in Cape Town.
Steyn finished with 4-56 and he was well supported by his team-mates, with spinner Paul Harris claiming 3-34.
Simon Katich (55) and Brad Haddin (42) were the main scorers for the tourists, who have already won the series, and gave a debut to spinner Bryce McGain.
In reply, South Africa ended the day on 57-0, with Ashwell Prince 37 not out.
Prince, recalled in place of injured Graeme Smith, hit McGain's second ball for six over long-on and he and debutant partner Imraan Khan (15) safely negotiated the final 14 overs of play.
Earlier, Australia began their innings well enough as Phillip Hughes and Katich shared an opening stand of 58, although both batsmen were dropped.
Harris eventually made the breakthrough by having Hughes lbw for 33 in the 23rd over and Albie Morkel, winning his first cap at the expense of his brother Morne, then had Australia skipper Ricky Ponting caught behind for a six-ball duck.
Speed-merchant Steyn got in on the act after lunch in a devastating spell that saw Michael Hussey and Michael Clarke fall in successive overs.
Hussey passed 3,000 runs in Tests in making 20 before he played on and Clarke became the second batsman to fall for nought when Steyn hit his off-stump.
Katich and Brad Haddin halted the slide by adding 71 in 20 overs, but the former played an injudicious sweep shot off Harris shortly before tea and was caught by Khan at mid-wicket.
Australia lost their last five wickets for just 51 runs, despite 35 by Mitchell Johnson, whose hit six fours to further enhance his claims for all-rounder status before hitting Steyn to Prince at long-on.
Johnson did not produce the same aggression with the new ball, however, conceding 24 from three overs.
And it was no surprise when Ponting chose to give McGain, who will be 37 next week, his first bowl in Test cricket shortly before the close.
Although he was immediately attacked by Prince, Khan looked far less assured and was beaten twice outside off stump in the final over of play to suggest McGain may have an important role if South Africa are to be prevented from making a big total.