Ireland were never likely to get close in the run chase and they soon put that presumption beyond doubt by collapsing to 48 for five in the 11th over. Dale Steyn got the initial breakthrough by having Paul Stirling caught behind and he would then get the important wicket of Ed Joyce in his next over. Kyle Abbott did the damage at the other end, dispensing with captain William Porterfield, Niall O'Brien and Gary Wilson during an impressive spell.
Andy Balbirnie did provide some cheer for the Irish contingent in the Manuka Oval crowd by compiling his maiden ODI half-century during a sixth-wicket stand of 81 with Kevin O'Brien. He was finally extracted for 58 off 71 balls by Morne Morkel, with the wickets of John Mooney and O'Brien for 48 following his dismissal pretty quickly.
The ninth-wicket pair of Max Sorensen and George Dockrell had a bit of fun to help take Ireland beyond 200, but Morkel wrapped things up to end with three for 34 and follow on from the earlier success of Steyn (2-39) and Abbott (4-21). Ireland were all out for 210 to lose by 211 runs and will now turn their attention to their must win game against Zimbabwe on Saturday in Hobart.
Earlier in the day, they had had some initial joy when Quinton de Kock was caught behind in Mooney's second over, but that would be their sole success for some time. Amla and du Plessis saw to that by putting on 247 in 36 overs.
Amla was first to three figures - his 20th ton in ODIs - off exactly 100 balls, with du Plessis bringing up his fourth off 103 soon after. The latter was finally bowled by Kevin O'Brien off a low full toss for 109, with Amla going to make 159 before he was caught off Andy McBrine.
AB de Villiers was next man to go, dazzling briefly during his nine-ball stay by clubbing two maximums, before he handed McBrine a second scalp when on 24. Rossouw and Miller, though, ensured that there would be no let up and added 110 off the final 8.3 overs of the innings. Boundaries aplenty were hit as Miller ended on 46 off 23 balls and Rossouw 61 off 30. South Africa ended on 411 for four - the second highest total in World Cup history.
South Africa's next match is against Pakistan in Auckland on Saturday.
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