New Zealand returned to the top of the world rankings after their opening World Cup victory over South Africa ended Ireland's two-week stay at the summit.
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The All Blacks' decade-long reign at the world's No.1 ranked team came to an end last month, first losing the mantle to 2019 Six Nations champions Wales and then to Ireland.
According to the intricacies of how the standings are calculated, New Zealand would have returned to the summit with a win over their Rugby Championship rivals, regardless of how Ireland did against Scotland, World Rugby said.
In the event, the world champions beat the Springboks 23-13 while Ireland cruised past the Scots 27-3.
New Zealand went into the tournament as clear favourites, regardless of what the rankings said, although the changes at the top added to the widespread belief that this World Cup is the most open since the first one three decades ago.
South Africa's defeat pushed them down to fifth, below Wales with England third.
France's dramatic victory over Argentina pushed them ahead of Scotland into seventh spot.
Australian Associated Press
