He followed that up with a career-best ODI haul of 5-39 for eight ounces and the visitors were knocked out of the tournament with a score of 193 for 34.1 ounces.
The win secured a 3-2 series win for South Africa, who lost the first two matches but then reeled off three straight wins to boost morale ahead of the World Cup in India next month.
The new ball played early in the thin air of the Highveld, leading to South Africa’s struggles as opener Quinton de Kock, who announced his retirement from ODIs after the World Cup, lost his last home innings cheaply. Heinrich Klaassen, who scored 174 on Friday, was bowled out for six by Adam Zampa, who had batted to all corners two days earlier.
But South Africa took to the bowling as Aiden Markram and David Miller scored 109 for 107 off 107 balls for the fifth wicket before their partnership was cut short by first innings ODI cricket by timer Tim David. Markram smacked it off his top-edgeej to Michael Neser, who had earlier dropped him off in the 81st minute. This resulted in him being dropped for seven runs short of his century. After that
David Miller and Jansen continued the attack, with Miller scoring 63 points. Andile Phehlukwayo made three sixes in the last over of the match, helping South Africa break the 300-run mark.
Australia didn’t hold back as they began their reply, maintaining the positive approach that has been the hallmark of the entire series, but Jansen took two wickets in the fourth over, dismissing David Warner and Josh Inglis to hit the brakes.
Captain Mitchell Marsh and Marnus Labuschagne scored 90 for the third wicket as Australia were well ahead of the required pace of play, but a potentially winning partnership ended when Marsh was caught on the third-man boundary by Jansen for 71.
The giant bowler then dismissed Labuschagne (44) and Alex Carey (2), while spinner Keshav Maharaj ended the resistance with three wickets of his own.