One-day international, Durban
Australia 247-9 beat South Africa 246-9 by one wicket
Mick Lewis shows his delight as Australia edge home
Australia beat South Africa by one wicket in a day-night game in Durban to take the five-game series to a decider.
Boeta Dippenaar hit 101 off 145 balls and Shaun Pollock added an unbeaten 53 as South Africa scored 246-9.
Adam Gilchrist and Simon Katich gave Australia a solid start with a stand of 87 before four wickets fell in 14 runs.
Andrew Symonds' 76 revived the visitors but it needed the last-wicket duo of Stuart Clark and Mick Lewis to edge them home with just five balls left.
Electing to bat first, the Proteas slumped to 9-2 as Nathan Bracken swung the new ball to dismiss Graeme Smith and Herschelle Gibbs.
Dippenaar then came to the fore and added 73 in an exciting third-wicket partnership with AB De Villiers.
Dippenaar has now hit four centuries in one-day internationals
De Villiers hit two sixes off Brett Lee before Lewis dismissed him lbw as he tried to pull a third.
Jacques Kallis, making his return from injury, showed some fine touches before hitting a Symonds full toss to deep midwicket for 21.
Neither Mark Boucher nor Justin Kemp got going, however, and it needed some uncomplicated hitting from Pollock to get South Africa to a decent score.
Pollock and Dippenaar added 72 from 54 balls with Pollock hitting an impressive 53 not out from just 33 deliveries.
Dippenaar, who later received the named man-of-the-match award, finally fell to Lee in the final over as Australia hit back in the final two overs, taking three wickets and conceding just seven runs.
Australia got off to a promising start thanks to Gilchrist (45) and Katich (46) but their double departure unsettled the team.
Ricky Ponting and Damien Martyn then succumbed during a stirring spell from paceman Roger Telemachus before Symonds swung the game back in Australia's favour with 76 off 71 balls.
He eventually fell to Telemachus too, clean bowled as he looked to hit another sweeping drive.
By then, Australia had also lost Michael Clarke and Mike Hussey, and soon after Symonds' wicket fell, Lee was also out, edging the ball behind to Mark Boucher for seven.
Nathan Bracken was clean bowled by Andrew Hall with two overs left but Clark (16 not out) and Lewis carried them home in the final over.
South Africa: G Smith (capt), H Gibbs, A Hall, M Boucher, A de Villiers, H Dippenaar, J Kallis, J Kemp, M Ntini, S Pollock, G Smith, R Telemachus.
Australia: A Gilchrist (Wkt), S Katich, R Ponting (Capt), D Martyn, A Symonds, M Clarke, M Hussey, B Lee, N Bracken, S Clark, M Lewis.