The Boks, the overwhelming favourites in this match, opened the scoring in the 10th minute when Bongi Mbonambi crashed over the line from a driving maul.
The more fancied Argentina capitalised on some Tongan handling errors in the first half to race to a quick lead and resisted a brave fight-back from the underdogs in an entertaining match at the Hanazono Rugby Stadium.
The three-times world champions have beaten Canada comfortably in the three times they've met in previous World Cups and whipped Namibia 58-14 when they met for the only time at London's Olympic Stadium four years ago.
Magnus Bradbury, Jamie Ritchie and Blade Thomson come in for John Barclay, Ryan Wilson and flanker Hamish Watson, who has flown home after a tournament-ending injury.
In a shock result that rivals their "miracle of Brighton" defeat of South Africa at the 2015 tournament, the Brave Blossoms took the lead through a Kenki Fukuoka try halfway through the second half and hung on desperately with a courageous defensive effort.
A ball of fire shot up high above the ship and thick black smoke billowed into the air, dramatic images showed.
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Harry, his wife Meghan and their four-month-old son Archie landed in South Africa on Monday for their first overseas tour as a family.
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US travellers should 'exercise increased caution', the State Department said on Friday in an updated travel advisory that cited reports of 'a probable Ebola-related death in Dar es Salaam'.
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The rockers were due to perform in Australia and New Zealand on their upcoming tour.
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The Interior Ministry decision accompanies the launch of a visa regime allowing holidaymakers from 49 states to visit one of the world’s most closed-off countries.
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