With the top-four batsmen scoring half-centuries, the all important winner-takes-it-all second Test, now has a Protean advantage over it. Day One was about, when their batsmen seized initiative.
South Africa's top four batsmen all made half-centuries as New Zealand's decision to bowl first failed to pay off on the first day of the series-deciding second Test .
South Africa were 283 for three at the end of a day when New Zealand were on the wrong end of no fewer than five leg before wicket decisions.
With 283 runs on the board, still seven wickets in hand and the top-four batsmen scoring fifties, Faf du Plessis' side can have a good night's sleep.
JP Duminy and Hashim Amla were at the crease as the players headed for Tea on Day One.
De Kock was the more aggressive batsman, reaching 58 not out at lunch, while Cook again played a cautious opener's role.
With the first Test being a total washout, South Africa face a stern test against New Zealand as they play the second and final Test of the series at Centurion
The first Test ended in a draw with no play on third, fourth and fifth day due to wet outfield.
In their 21 Tests so far at the venue, South Africa have won as many as 16 Tests. They have lost only twice, and 3 Tests have been drawn.
The first Test between South Africa and New Zealand drew as rain abandoned the play at Durban.