South Africa are targeting their second tournament win in as many weeks after taking glory in the opening round of the World Series in Dubai on Sunday (December 3).
They won only one of their three matches - beating Spain 36-12 - but losing 31-14 to the U.S. and 35-12 to neighbours New Zealand.
New Zealand also had the last word in the fight when Joe Webber ran in the last try of the match to take the score to 19-12.
The second half belonged to New Zealand, however, as further tries followed from captain, Tim Mikkelson and Regan Ware (2) saw them race into a massive lead.
A 12-7 halftime lead was never going to be enough for the Blitzboks, and when Vilimoni Koroi sped away from the SA defence to level the scores, the Kiwis had the edge.
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Argentina pegged back a much needed try to close out the first half with Lautaro Bazan Velez crashing over to cut the deficit to seven.
In the semifinals, New Zealand beat series leaders and defending champions South Africa 19-12 to advance to the title match.
Taking on the Blitzboks in front of almost 50,000 parochial South Africans, New Zealand started on the back foot as Philip Snyman crossed after just a minute of play.
Argentina beat United States of America 28-12 in the quarterfinals, before edging Canada 14-12 in the semifinals.
McConnochie crossed for his second upon the resumption, but New Zealand immediately responded with a try to Dylan Collier, making it 12-10 to the English.