Leigh Halfpenny has warned that Wales will need "to be on the money for 80 minutes" this weekend in their pursuit of a prize that has eluded them for six painful years.
Wales have not beaten a southern hemisphere giant - Australia, New Zealand or South Africa - since autumn 2008, a run of 20 defeats.
"We are striving to be the best in the world, and to be that you have got to beat the best," said Halfpenny. "Saturday is an opportunity to do that. We know it's going to be a challenge, but one we are very much looking forward to and one where we are determined to come away with the win. We have been there or thereabouts.
"It's about concentration for the full 80 minutes."
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