South Africa won the toss and decided to bat first in the second Twenty20 international against Australia at St George's Park on Sunday. South Africa made three changes after suffering a record 107-run defeat in the first match in Johannesburg on Friday. "We're all good," said South African captain Quinton de Kock. "We understand today is very important." De Kock said he expected the pitch "might get a bit slower" later in the match. Opening batsman Reeza Hendricks, all-rounder Dwaine Pretorius and fast bowler Anrich Nortje came into the South African team in place of Jon-Jon Smuts, Andile Phehlukwayo and Dale Steyn. Australia were unchanged. "We bowled great lengths the other night," said Australian captain Aaron Finch. "The pitch is a lot drier than it was in Johannesburg. It will perhaps skid a bit and turn a bit later." Teams: South Africa: Quinton de Kock (capt, wkt), Reeza Hendricks, Faf du Plessis, Rassie van der Dussen, David Miller, Pite van Biljon, Dwaine Pretorius, Kagiso Rabada, Anrich Nortje, Lungi Ngidi, Tabraiz Shamsi Australia: Aaron Finch (capt), David Warner, Steve Smith, Matthew Wade, Mitchell Marsh, Alex Carey (wkt), Ashton Agar, Pat Cummins, Mitchell Starc, Kane Richardson, Adam Zampa Umpires: Bongani Jele, Allahudien Paleker (both RSA) TV umpire: Adrian Holdstock (RSA) Match referee: Andy Pycroft (ZIM) str/jc