Defending a modest 189 for nine on another pitch that challenged the patience and technique of all batsmen, the Proteas bowlers were resisted only by opener Aaron Finch's defiant 72 before he was ninth out as the World Cup-holders folded for 142 off 34.2 overs.
By virtue of their margin of victory, South Africa also earned a bonus point and leapt from last to first on net run-rate over Australia, leaving hosts West Indies third. Competition resumes in St Kitts on Saturday with South Africa and Australia renewing their rivalry at Warner Park.
Farhaan Behardien's workmanlike innings of 62 held South Africa's innings together and earned him the 'Man of the Match' award. However pacer Kagiso Rabada shared the plaudits with a useful unbeaten 15 as the tail contributed important runs and then led the way with the ball as he claimed three for 13 off seven probing overs.
Rabada disposed of Usman Khawaja in his opening spell and returned to account for wicketkeeper-batsman Matthew Wade and tailender Nathan Coulter-Nile in an excellent display of controlled fast bowling. His effort was supported by Wayne Parnell, who shared the new ball and got rid of the dangerous David Warner in his very first over.
Playing his first ODI for almost 16 months, Parnell then trapped Australian captain Steve Smith leg-before.

Spinners Imran Tahir and Aaron Phangiso then tightened the stranglehold with two wickets apiece, while Tabraiz Shamsi, the left-arm leggie, marked his debut with the wicket of Glenn Maxwell in his first over to ensure there was no escape for the Aussies.
"We started well with the two seamers although this wasn't the kind of surface where they were having the time of their lives," captain AB de Villiers said.

"(Tabraiz) Shamsi was a handful for their batters. I didn't see a lot of them picking him."

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