Rassie van der Dussen and Quinton de Kock hit centuries as the Proteas edged closer to sealing a place in the Cricket World Cup semifinals with a comprehensive 190-run victory over New Zealand.
New Zealand made it four straight wins to move top of the World Cup table by thrashing Afghanistan by 149 runs in Chennai.
Kane Williamson suffered a fractured thumb in Friday's World Cup victory over Bangladesh and will be sidelined until the latter stages of the tournament.
New Zealand maintained their perfect start to the World Cup as they eased to a comfortable eight-wicket win over Bangladesh in Chennai.
England's World Cup defence began with a punishing nine-wicket defeat in Ahmedabad as New Zealand helped themselves to a slice of revenge.
The Proteas are set to tour New Zealand to take on the hosts in a two-match Test series in February next year.