Ton-up Williamson on Wednesday led New Zealand to victory in nail-biting thriller against sloppy South Africa.
Williamson made 103 runs and remained unbeaten.
With this victory, the Kiwis have also extended their unbeaten streak in the ICC World Cup 2019. Kane Williamson was decalred MoM.
C de Grandhomme also made useful contributions with rapid 60 runs on just 47 deliveries. His innings included five boundaries and two maximums.
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Chris Morris took three wickets.
Earlier, HE van der Dussen led South Africa to 241 with his unbeaten 67. Miller also made 36 runs.
Ferugson picked three wickets.
With this victory, New Zealand has climbed regained top spot on points table.
