You are right, we cannot take the Australian team into the underestimating, but South Africa International cricket team won the series by 2-0 because South Africa cricket team performance is very dominanting in this series and they won the series one sided as many players are looking in excellent form and Australia cricket team is not small team but that team could not stay in the front of these players.
Proteas now have golden chance to whitewash Australia in ODI series as they have won both the ODIs. The way Proteas are going in this series, it looks like they will easily win the last ODI also. Lungi Ngidi brilliant spell helped South Africa in winning the second ODI and the series, he picked 5 wickets and gave away just 42 runs. Australia lost the first ODI by 98 runs and today they won the match by 84 runs, this shows the dominance of South Africa in this ODI series.