Is it the Rugby World Cup semifinals or the Rugby Championship semifinals?

It's an all-Southern Hemisphere final four for the 2015 Rugby World Cup with Argentina and Australia joining the All Blacks and South Africa in the semifinals following wins this morning.

Argentina put in a dominate performance against Ireland to win 43-20 while Australia held off a staunch Scottish challenge to reach the semifinals for the sixth time.

It is the first time in World Cup history that the Northern Hemisphere has failed to have a side reach the semifinals. Their previous worst representation was in the 1999 tournament when France were the only Six Nations side to make the final four.

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The four wins over the weekend means the Rugby Championship sides will finish the tournament with a 7-0 win/loss record against the Six Nations.

Australia won an abbreviated Rugby Championship earlier this year with three wins from three. The semifinals draw replicates week two of this year's Rugby Championship, when the Wallabies beat Argentina 34-9 in Mendoza and the All Blacks edged the Springboks 27-20 in Johannesburg.

All Blacks v France highlights

South Africa v Wales highlights

Argentina v Ireland highlights