Australia won the toss and chose to bat.
Rabada now has five demerit points to his name, having picked up a third sanction by the ICC in the past 12 months with his send off of India's Shikhar Dhawan in the fifth match of their one-day series last month. In a fiery spell of fast bowling, he tore apart Australian middle and lower order en route to a five-for.
In fact, there could hardly have been any less action in the first hour.
The breathtaking nature of this contest is showing no indications of abating as South Africa and Australia continue to try to pummel each other into submission. South Africa should go to bed happy with their day, despite losing Aiden Markram during a challenging little batting period they faced as evening approached.
Cricket Australia has released a statement on the controversy-marred recently concluded the first Test between South Africa and Australia in Durban.
The hearing will be conducted by International Cricket Council match referee Jeff Crowe. Infuriated and animated at the wicket, Kagiso Rabada rubbed his shoulder against Smith. They are free to play the second Test starting Friday in Port Elizabeth, although Warner was also given three demerit points, meaning he will be banned if he gets one more within the next year.
South Africa are expected to argue Rabada's contact with Smith, which came amid a spirited send-off in which he also screamed in the face of Australia's captain, was not deliberate.
Call it passion or petulance, the fiery 22-year-old couldn't control himself after claiming the first of five wickets he snared on day one of the second Test.
He had Smith and Shaun Marsh out lbw, with both failing with reviews, and Mitchell Marsh was caught behind by de Kock attempting an expansive drive at an inopportune moment just before the tea break.
"But if we get the ball in the right areas tomorrow, it is going to be hard to score on because the wicket is doing just a bit for the bowlers".
David Warner appeared to put the sledging dramas of the first test behind him, scoring 63 in his 98-run opening partnership with Cameron Bancroft.
Warner rejected South Africa's accusations that he subjected de Kock to personal abuse.