An unbeaten century from captain Kane Williamson led New Zealand to a tense four-wicket win over South Africa in the World Cup on Wednesday.

The result not only maintained New Zealand’s unbeaten record in this tournament but also pushed South Africa closer to the exit with their fourth defeat from six games.

Proteas skipper Faf du Plessis admitted qualification from this stage seems extremely unlikely and that the dressing room is low on confidence.

“Yeah, it’s tough now. I mean… you can feel (it in) the dressing room. The guys are… they’re hurting,” Du Plessis said.

“I’m feeling five years older, my body’s really sore after that. So, we left everything out there. And, that’s all I can ask for as a captain, that the guys fight. They showed that. Unfortunately we’ve just not been, as good as the opposition we’ve played against.”