Its a winning position and it's their match to lose. They were also in winning position against India in t-20 wc and choked so fingers crossed for South Africa. Hope both these batters lord Buvama and sasta KL Rahul (Markam lol) breaks the jinx.
I doubt they will choke now considering that they still have many capable batsmen remaining. My bet on South Africa is looking really good right now and I hope Markram and Bavuma themselves take them to the finish line.
This win wouldn't just break their curse, but also indicate they defeated the Aussies at full power which is something special. Go Proteas all the way.