David Warner and Aaron Finch launched a brutal assault on the South African bowlers to set up a comprehensive 97-run Australian victory in the series-deciding third T20I at Newlands.
In a near-repeat of Australia's record 107-run win in the first match of the series in Johannesburg, South Africa captain Quinton de Kock's decision to bowl first backfired spectacularly.
Led by opening batsmen Warner (57) and captain Finch (55), Australia piled up 193 for five -- three fewer than they made in Johannesburg.
They then bowled out South Africa for 96, just seven more than the host country's record low in Johannesburg.
As in Johannesburg, left-arm fast bowler Mitchell Starc bowled De Kock, South Africa's star batsman, in the first over of the home team's reply. He followed up by dismissing former captain Faf du Plessis in the third over and was named man-of-the-match after taking three for 23.
Brief Scores: Australia 193/5 in 20 overs (David Warner 57, Aaron Finch 55; Tabraiz Shamsi 1-25) beat South Africa 96 in 15.3 overs (Rassie van der Dussen 24, Heinrich Klaasen 22; Ashton Agar 3-16, Mitchell Starc 3-23) by 97 runs.