Basseterre - Australia defeated South Africa by 36 runs in the fourth match of the Tri-Nation One-Day International series at Warner Park in St Kitts on Saturday.
Australian opener David Warner was named man of the match after his 109 helped his team post 288/6 in their allotted 50 overs.
In reply, the Proteas were bundled out for 252 in 47.4 overs.