The rain in Borneo abated in time for South Africa and Ireland to play a 10-over-a-side encounter, with the South Africans coming out on top by seven wickets.
Ireland won the toss and chose to bat, but soon found themselves in trouble. Freya Sargent looked good on her way to nine, but was pinned in front by Fay Cowling.
Kayla Reyneke (3/2) then made inroads including two wickets in three balls to leave Ireland in trouble at 10 for three.
Monalisa Legodi’s introduction proved a masterstroke as she wreaked havoc with her inswingers, finishing with figures of four for four.
Abbi Harrison and Julie McNally were both bowled by Legodi, who picked up three wickets in one over with Ireland in all sorts of trouble at 26 for seven.
They were eventually bowled out for 35 with two balls left of their 10 overs.
The reply did not start brilliantly, Jemma Botha trapped LBW by Jennifer Jackson for four.
Jackson then bowled Diara Ramlakan with another inswinger as South Africa found themselves six for two after one over.
Any nerves were eased by skipper Reyneke, who scored an unbeaten 16, adding 28 with Simone Lourens (14) before the latter skied one with just two left to win.
Reyneke finished the job with the first ball of the seventh over to seal another win for South Africa, who matched Australia in making it four from four.