Estimations of South Africa's tally were duly revised a couple of times, with the rate climbing from a humble 3.5 after 18 overs to well beyond the six mark.
"What I like about him is that he has different paces to his game", he said of Miller, who was also named man-of-the-series for his tally of 192 runs.
South African captain Graeme Smith celebrates after his team's won the first Test between Australia and South Africa at Newlands Stadium in Cape Town on November 11, 2011. We had a big challenge for ourselves to put in a big performance and pleased that we could do it. "It was a good review in the end, wasn't it?" Australia, in reply, saw Shaun Marsh lead the chase with a hundred, but eventually lost stead and slumped to 280 for 9 and conceded the series. The pair contributed 80.2% of South Africa's final total which is the fourth-highest ever in a completed innings by batsmen at No. 4 and 5.
"When he gets through that he has 10-15 overs at the end, he is up there with the best when it comes to clearing the rope".
Lungisani Ngidi and Kagiso Rabada chipped in with a wicket each before Australia could make 40 runs.
And although both of them departed in the final two overs, they had done enough damage to take South Africa to what proved to be a winning total.
The visitors were asked to bat first by the hosts.
Mitchell Starc did the damage, bowling a flawless line and length, with de Kock getting a tickle on the ball and wicketkeeper Alex Carey taking the catch.
Aiden Markram smashed three sixes, including one huge blow off Marcus Stoinis that went out of the ground and down the street, with a new ball needed, on his way to 32.
But as he looked set for a big score, he tried to flick a Starc delivery down the leg side and Carey grabbed his third catch of the game to leave South Africa struggling.
Du Plessis' 114-ball innings included 15 fours and two sixes and was his 10th century in global one-dayers, while Miller's vindicated his elevation up the batting order.
Then hard-hitting Miller joined skipper du Plessis and the scoreboard began racing along.
Miller, on the other hand, slammed 13 boundaries and four sixes for his 108-ball 139.
Australia too did not get off to a great start as the experienced Dale Steyn dismissed Chris Lynn for a golden duck.
Australia's woes were compounded when Aaron Finch soon followed him back to the pavillon. They put on an impressive 107 before Stoinis was caught at backward point.
Marsh continued on with Alex Carey (42) and reached his century off 98 deliveries.