Nothing scientific, but just a guideline for matchups. Listing is opinionated, as can be seen from, for instance, Slovenia (which beat out Russia and Czech Republic). S. Africa's relatively high listing is because of home field advantage. I'll keep track during the tournament, as here two years ago http://forum.sbrforum.com/soccer-han...2008-a-p3.html). Euro is easier for me than WC, so I'm not expecting rankings to perform like that again. Feel free to add your complete rankings, so we can compare accuracy during the tournament, and go with the best list. 
Spain
Brazil
Netherlands
Argentina
Italy
Germany
Portugal
England
Cameroon
France
Mexico
Serbia
S. Africa
Nigeria
Slovenia
Greece
Ghana
Denmark
USA
Ivory Coast
Switzerland
Uruguay
S. Korea
Paraguay
Slovakia
Australia
Chile
Algeria
Honduras
Japan
N. Korea
New Zealand

Spain
Brazil
Netherlands
Argentina
Italy
Germany
Portugal
England
Cameroon
France
Mexico
Serbia
S. Africa
Nigeria
Slovenia
Greece
Ghana
Denmark
USA
Ivory Coast
Switzerland
Uruguay
S. Korea
Paraguay
Slovakia
Australia
Chile
Algeria
Honduras
Japan
N. Korea
New Zealand