Cape Town - Career best bowling figures by Kagiso Rabada helped the Proteas secure a 133 run lead after England were dismissed for 342 in their first innings of the fourth Test at SuperSport Park in Pretoria.
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Rabada, who had picked up two wickets on Saturday afternoon, added a three during the morning session, ripping the heart of of the England middle order by removing Joe Root, James Taylor and Jonny Bairstow just before lunch.
He then added the wickets of the dangerous Ben Stokes and Stuart Broad in the afternoon session to end with 7 for 112 in his 29 overs.
The Proteas lead could have been larger, but an excellent rearguard action by Moeen Ali - last out for 61 - ensured England didn't concede as big a lead as it once looked like they might after Rabada's morning heroics.
Ali first put on a 41 run partnership with Ben Stokes followed by 43 with Chris Woakes.
The England all-rounder managed to keep much of the strike in the final two partnerships of the innings, adding a further 25 runs for the ninth wicket with Broad and then 22 with James Anderson.
The day however belonged to Rabada who now has 18 wickets in six Tests at an average of 31.16.