Bangladesh have won the toss and decided to bowl in the decisive T20I in Potchefstroom.
The Proteas won the first T20I in Bloemfontein by 20 runs. They will be favourites to win the second fixture in Potchefstroom today, and clinch the two-match series 2-0.
The hosts have made two changes. Mangaliso Mosehle replaces Quinton de Kock, while Dwaine Pretorius comes in for Dane Paterson.
South Africa: 1 Mangaliso Mosehle, 2 Hashim Amla, 3 JP Duminy, 4 AB de Villiers, 5 David Miller, 6 Farhaan Behardien, 7 Andile Phehlukwayo, 8 Dwaine Pretorius, 9 Robbie Frylinck, 10 Aaron Phangiso, 11 Beuran Hendricks
Bangladesh: 1 Imrul Kayes, 2 Soumya Sarkar, 3 Shakib Al Hasan (c), 4 Mushfiqur Rahim (wk), 5 Mahmudullah, 6 Sabbir Rahman, 7 Liton Das, 8 Mehedi Hasan, 9 Rubel Hossain, 10 Mohammad Saifuddin, 11 Taskin Ahmed