JOHANNESBURG : Australia won the toss and decided to bat in the second and final Twenty20 international against South Africa at the Wanderers Stadium on Sunday.Both teams showed one change following the first match, which Australia won by five wickets in Cape Town on Thursday.South Africa picked left-arm seam bowler Wayne Parnell ahead of left-arm spinner Robin Peterson, while Mitchell Marsh earned his first cap for Australia in place of fellow all-rounder Shane Watson.Australian captain Cameron White said Watson had a minor hip injury but would be fit for the first one-day international at Centurion on Wednesday. Marsh, 19, will be playing along side older brother Shaun. They are the sons of former Australian opening batsman Geoff Marsh.Conditions looked ideal for batting on a hot afternoon.South Africa: Hashim Amla (captain), Graeme Smith, Colin Ingram, JP Duminy, David Miller, Heino Kuhn, Johan Botha, Wayne Parnell, Lonwabo Tsotsobe, Morne Morkel, Rusty Theron.Australia: Cameron White (captain), David Warner, Matthew Wade, Shaun Marsh, David Hussey, Steve Smith, Mitchell Marsh, Steve O'Keeffe, James Pattinson, Pat Cummins, Doug Bollinger.Umpires: Johan Cloete and Shaun George (both RSA), TV umpire: Marais Erasmus (RSA)Match referee: Javagal Srinath (IND)