Carl Hayman (New Zealand)
World-class tighthead props are a rare breed, but in 27-year-old Hayman, New Zealand possess currently the best in the business.
For all the stellar qualities of a back division containing players like Carter, Joe Rokocoko, Aaron Mauger and Mils Muliaina, they will do little without the forwards providing rock-like foundations.
Hayman, who joins Newcastle after the World Cup ends in October, must shine when it comes to one of rugby's most fundamental jobs - anchoring the scrum - as New Zealand looks to justify its favourites tag.