South Africa rested three of their frontline bowlers but continued to dominate Australia as they won the fourth one-day international by six wickets at St George's Park on Sunday. Kyle Abbott led what was effectively South Africa's back-up bowling attack as Australia were bowled out for 167, the lowest total of the series.
South African captain Faf du Plessis made 69 as South Africa secured their fourth successive win with 14.3 overs to spare.
It left Australian captain Steve Smith having to contemplate the prospect of a 5-0 series defeat going into the final match in Cape Town on Wednesday.
"We don't want a whitewash so well have to turn up and play," he said. Smith said he was disappointed with the batting performance.
"The wicket maybe wasn't as good as the others but 250 was about par."
Having clinched the five-match series by winning the first three games, South Africa rested fast bowlers Dale Steyn and Kagiso Rabada and leading spin bowler Imran Tahir.
They were replaced by Abbott and spinners Tabraiz Shamsi and Aaron Phangiso.
Man of the match Abbott admitted that he felt nervous before the game, having not been part of the first three matches.
But he bowled both Australian opening batsmen inside the first three overs and finished with four for 40. Unorthodox left-arm wrist spinner Tabraiz Shamsi took three for 36 and orthodox left-armer Phangiso picked up the last two wickets at a cost of 17 runs.
On a slow pitch, which offered some seam movement and uneven bounce, Abbott bowled a full length and made the ball deviate in both directions. George Bailey was leg before wicket to Dwaine Pretorius as Australia slumped to 12 for three.

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Australia
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A. Finch b Abbott                    2
D. Warner b Abbott                   6
S. Smith lbw b Shamsi               21
G. Bailey lbw b Pretorius            1
M. Marsh c De Kock b Abbott         50
T. Head lbw b Shamsi                 0
M. Wade lbw b Phangiso              52
J. Hastings lbw b Shamsi             4
A. Zampa b Abbott                    5
C. Tremain not out                  23
S. Boland lbw b Phangiso             0
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Extras: (w3)                         3
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Total: (36.4 overs)                167
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Fall of wickets: 1-2 (Finch), 2-9 (Warner), 3-12 (Bailey), 4-49 (Smith), 5-49 (Head), 6-111 (Marsh), 7-116 (Hastings), 8-121 (Zampa), 9-167 (Wade)
Bowling: Abbott 8-0-40-4, Pretorius 7-1-33-1 (1w), Shamsi 10-1-36-3 (1w), Phehlukwayo 5-1-28-0 (1w), Phangiso 4.4-0-17-2, Duminy 2-0-13-0

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South Africa
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H. Amla lbw b Tremain                4
Q. de Kock c Zampa b Tremain        18
F. du Plessis c Head b Marsh        69
J. Duminy c Marsh b Zampa           25
R. Rossouw not out                  33
F. Behardien not out                12
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Extras: (lb3, w4)                    7
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Total: (4 wkts, 35.3 overs)        168
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Fall of wickets: 1-8 (Amla), 2-29 (De Kock), 3-85 (Duminy), 4-140 (Du Plessis)
Bowling: Tremain 10-0-48-2 (3w), Boland 10-2-36-0 (1w), Hastings 4-0-27-0, Zampa 6.3-0-32-1, Marsh 5-0-22-1
Did not bat: D. Pretorius, A. Phehlukwayo, K. Abbott, A. Phangiso, T. Shamsi
Result: South Africa won by six wickets
Series: South Africa lead the five-match series 4-0
Toss: Australia
Umpires: Adrian Holdstock (RSA), Nigel Llong (ENG)
TV umpire: Joel Wilson (WIS)
Match referee: Chris Broad (ENG)
Remaining match:
Oct 12 Cape Town.