RWC: The clash of the titans

The back to back champion All Blacks take on two time winners South Africa in the match of the weekend at the Rugby World Cup in Japan. Both teams are eager to stamp their mark with a dominant performance in Yokohama tomorrow night. So are the Boks capable of putting a dent in the All Blacks hopes of a three-peat? And how much would a loss in pool play hurt the defending champs? Rugby reporter Joe Porter is in Tokyo.