Jacques Kallis says South Africa cannot allow New Zealand to dictate proceedings in their must-win World Cup clash at Edgbaston on Wednesday.
South Africa finally clinched their first victory at the 2019 World Cup on Saturday with a routine win over bottom-placed Afghanistan in Cardiff.
However, having lost their first three matches of the tournament, Faf du Plessis side remain in a desperate position as they attempt to make up ground in the group stage table.
Defeat to unbeaten New Zealand would essentially end South Africas hopes of reaching the semi-finals and Kallis says the team must be aggressive with bat and ball.
The legendary all-rounder told ICC: The Kiwis always play well in these tournaments and they are always contenders. They also find ways to do something different and be unpredictable.
It will be a big test for South Africa who will have to be at their very best if they are going to win. For me, the key is to get off to a good start, with bat or ball.
Weve seen throughout this World Cup that if you keep wickets in hand, you can really post some big totals. If you lose wickets early, then it can be tough for the players coming in to get in.
South Africa will have to be aggressive with the ball as well. They have to be the ones to throw the first punch in the game.
They cannot let New Zealand dictate, they have to try to smother them from the off. That will not be easy though.
South Africa legend Kallis also defended opening batsman Hashim Amla, who was criticised for his innings in the win over Afghanistan.
Chasing just 125, Amla scored 41 off 83 balls but Kallis said: I was really pleased to see Hashim get some runs.
It wasnt a case of scoring quickly, but instead getting some time out in the middle. The run-rate did not really matter, it was about getting some form and Hashim did just that.