Argentina's impressive triumph over Ireland at the Rugby World Cup has lifted the Pumas up to fourth in the world rankings.
Defeats for Wales, France, Ireland and Scotland in the Rugby World Cup quarter-finals have resulted in an all-southern hemisphere top four in the world rankings for the first time since March 2009.
The four nations through to the semi-finals now occupy the leading positions in the rankings, Argentina climbing to fourth following their stunning 43-20 victory over Ireland at the Millennium Stadium on Sunday.
New Zealand, who emphatically confirmed their standing as tournament favourites by trouncing France 62-13 in Cardiff, remain top, ahead of Australia and South Africa.
Wales are the highest-ranked country from the northern hemisphere, in fifth, with Ireland " third ahead of their meeting with Argentina " slipping to sixth.
France, England, Scotland and Japan round off the top 10.