England are constantly reminding themselves about the threat their first World Cup opponent, Fiji, represent in a match which kicks off the tournament on Saturday NZT.
For the All Blacks, their first opponents, Argentina, don't need to be talked up. They would have been aware of the threat as soon as the draw was made because Argentina have form at World Cups.
The Pumas, who pushed the All Blacks hard in their quarter-final at Eden Park in 2011 before the home side got on top in the final quarter, finished third in the 2007 edition of the tournament.
They also achieved the remarkable feat of beating the Springboks in Durban in this year's Rugby Championship.
They are big, powerful men not fazed by playing on the big stage and that is why they are the perfect first game for the All Blacks. There will be an edge about Steve Hansen's men this week as they prepare for the match at Wembley on Monday NZT because it will be the defining one of their pool as far as they're concerned.