He has stated this in the wake of his country having secured a win over the Asian nation on Sunday.
“I thought we played our best game of cricket (of the tour),” said Du Plessis after winning the series 2-1.
“We challenged ourselves to put in a performance.
“From a batting point of view, we were good but from a bowling point of view, we were quite excellent.” He summed up.
Du Plessis who registered his 10th ODI century and fourth against the Australians ultimately suffered dismissal.
And that was due to the fact that he actually caught off a rank long-hop from Stoinis.
The damage had, however, already been done with the Proteas skipper on his part smashing 15 boundaries and two sixes.
Australian captain, Aaron Finch hailed the combination of Marsh and Stoinis.
In-spite of that, though, he made a honest admittance that the South African attack was simply too hot to handle.
“They bowled exceptionally well at the end and massive credit to them in the last ten overs,” the Aussie said.
“After 35 overs, we were in a great position but they took it away at the end,” he summed up.
The two nations will now shift all of their concentration on the one-off T20 international which takes place next Friday.
Proteas defeat Australia by 40 runs to win ODI series
The Proteas of South Africa defeated Australia by 40 runs to win the one-day international series 2-1.
And that is as a result of centuries from the duo of David Miller and Faf du Plessis.
Victory also came courtesy of a three-wicket haul from veteran, Dale Steyn at the Bellerive Oval in Hobart on Sunday.
Man of the match, Miller smashed in a total number of 139 from 108 deliveries.
And his skipper, Du Plessis cracked 125 from 114 balls as the pair shared in a record 252-run stand.
That was for the fourth wicket as the Proteas posted 320 for five after they had to bat first.
Responding, Australia seemed to be within reach as Shaun Marsh (106) and Marcus Stoinis (63) were both at the crease.
But once the South Africans broke the fourth-wicket stand of 107, the home side fell behind.
And that was despite valiant efforts from Alex Carey (42) and Glenn Maxwell (35).
That then gave the African nation the opportunity to restrict Australia to 280 for nine.
The Proteas secured only their third ODI series on Australian soil since the year 1993.
But their last one came through back in the year 2009.
However, it was the fourth-wicket stand between Miller and Du Plessis which set the tone for the mammoth total.
It has also now become the first time ever whereby the Proteas have posted more than 300 in the Antipodes.