Proteas paceman
Proteas beat Black Caps to lead series
New Zealand were put in to bat first and were bowled out for 230.
South Africa sailed into the semi-finals with a three-run victory over former champions England.
The proteas crumbled at the end in their 166 run chase against Sri Lanka in a T20 match in Bangladesh.
Tsotsobe took two wickets in successive overs to finish with 2/28.
Proteas strength and conditioning coach Greg King says they are now prepared for the heat.
Dale Steyn bowled at full intensity in the nets, raising hopes he will be fit for the West Indies match.