Ricky Ponting [Images] scored a century in each innings of his 100th Test to steer Australia to an extraordinary eight-wicket win over South Africa on Friday.

The Australian skipper smashed an unbeaten 143 to add to his brilliant 120 two days earlier as the world champions stole an unlikely victory to complete a 2-0 series win.

The South Africans, needing to win the third and final match to square the series, gambled everything on a calculated last-day declaration that backfired horribly on them.

Graeme Smith [Images] aborted his team's second innings at 194-6 an hour before lunch, setting Australia a record run-chase of 287 off 76 overs to win, a required run-rate of 3.8 per over.

The odds were stacked in South Africa's favour. No team had scored more runs in the fourth innings to win a Test at the Sydney Cricket Ground. The previous record, set more than a century ago, was Australia's 276-4 to beat England [Images] in 1898.

But the Australians, playing the game like a one-day match, tore up the history books with a ferocious display of batting, racing to their target with almost 16 overs to spare and averting the threat of a late thunderstorm.

South Africa had made an encouraging start when Charl Langeveldt clean bowled Justin Langer for 20 in the last over before lunch but their hopes were dashed when Ponting and Matthew Hayden [Images] piled on 182 runs for the second wicket, including 150 in the middle session.

Hayden eventually fell for 90, caught by Smith at backward point off Johan Botha, leaving Brad Hodge (27 not out) to finish off the job. But all the accolades went to Ponting, who was a unanimous choice for player of the match and the series.

The 31-year-old, now officially entrenched as the world's number one batsman, smashed 16 boundaries in a chanceless innings spanning 201 minutes off 159 balls, passing a series of important milestones along the way.

Ponting became the first player to score centuries in each innings of his 100th Test, taking his career tally to 28 Test hundreds and moving into sixth place overall, just one behind Don Bradman.

He lifted his career aggregate to 8,253 runs at an average of 57.71, overtaking Rahul Dravid [Images], Mark Waugh [Images], Garry Sobers, Inzamam-ul-Haq [Images], Geoff Boycott and David Gower to move into the all-time top 10 of Test run-scorers.

Ponting also became the first player to score five Test hundreds at the SCG as well as overtaking Allan Border [Images] as the most prolific scorer at the ground.

South Africa could feel aggrieved at the result. They had led by 92 on the first innings but were forced into making a generous declaration after two days of heavy rain had stalled their bid to build a bigger lead.

With more rain forecast for Friday afternoon, they made their declaration after chalking up 100 runs for the loss of three wickets in the morning session.

Jacques Kallis [Images] finished undefeated on 50 after batting for three hours while Shaun Pollock [Images] made 26 not out, smashing two boundaries and a six in his 21-ball innings.

Leg-spinner Stuart MacGill captured all three South African wickets to fall in the morning to finish with 3-33 off six overs.

First-innings century-maker Ashwell Prince was caught by a leaping Ponting at short mid-wicket for 18, Jacques Rudolph holed out to Glenn McGrath at mid-on for four and Mark Boucher [Images] was stumped by Adam Gilchrist [Images] on 11.

Scores:

South Africa  1st innings  451 for 9 decl  (A. Prince 119, J. Kallis 111)
Australia     1st innings  359 (R. Ponting 120, A. Gilchrist 86; A. Nel 4-81)

South Africa 2nd innings (Overnight: 94-3)
G. Smith        lbw b McGrath                         5
A. de Villiers  lbw b Lee                             1
H. Gibbs        run out                              67
J. Kallis       not out                              50
A. Prince       c Ponting b MacGill                  18
J. Rudolph      c McGrath b MacGill                   4
M. Boucher      st Gilchrist b MacGill               11
S. Pollock      not out                              26
Extras          (b-3 lb-4 nb-2 w-3)                  12
Total           (for 6 wickets declared, 42 overs)  194

Fall of wickets: 1-4, 2-6, 3-92, 4-123, 5-129, 6-152

Did not bat: C. Langeveldt, A. Nel, J. Botha

Bowling
G. McGrath      15 - 2 - 61 - 1 (nb-1)                
B. Lee          10 - 3 - 48 - 1 (nb-1)                
S. Warne        11 - 1 - 45 - 0 (w-3)                 
S. MacGill      6 - 1 - 33 - 3                        

Australia 2nd innings (Target: 287 runs)

J. Langer       b Langeveldt                         20
M. Hayden       c Smith b Botha                 90
R. Ponting      not out                              143
B. Hodge        not out                              27
Extras          (lb-1 nb-4 w-3)                       8
Total           (for 2 wickets, 60.3 overs)         288

Fall of wickets: 1-30, 2-212

To bat: M. Hussey, A. Symonds, A. Gilchrist, S. Warne, B. Lee, S. MacGill, G. McGrath

Bowling                                            
S. Pollock      14 - 2 - 55 - 0 (nb-2 w-1)            
C. Langeveldt   14 - 1 - 52 - 1 (nb-2)                
A. Nel          7 - 0 - 46 - 0                        
J. Botha        12.3 - 0 - 77 - 1 (w-1)               
J. Kallis       2 - 0 - 8 - 0                         
J. Rudolph      11 - 0 - 49 - 0 (w-1)                 

Result: Australia won by 8 wickets