Wales - South Africa: Easy win for SA. Their pack is dominating the rucks and they won't give Wales the chance they got against Australia.
New Zealand - France: The last time these 2 teams met in the QF, the game was also played in Cardiff. I feel France has a chance to win this, like they did in 2007. For some reason, the French play a type of rugby that the All Blacks struggle with. Close game, but I really think France will win this
Australia - Scotland: A tricky one. Depending on the weather, Scotland has a chance. They beat Australia in Newcastle (Aus) a few years back when the weather was abysmal. In 2010 they beat the Springboks in Edinburgh again with bad weather. If it's a dry pitch, Australia should win this easily
Argentina - Ireland: Easy win for Ireland. No question.