By Helen Chandler, CNN
London, England (CNN) -- Tradition dictates that with every World Cup there is a new official ball used for the tournament. But it seems that with every new ball there also comes a great deal of controversy.
It is hard to think of a World Cup that has gone by where a player or a coach has not complained about the ball.
In 2002, the Adidas "Fevernova" used in South Korea and Japan was lighter than those used before and was believed to help the more technical players, with Italy's goalkeeper Gianluigi Buffon labeling it as a "ridiculous kiddie's bouncing ball".
And in 2006, Germany goalkeeper Oliver Kahn claimed that the same company's heavier "Teamgeist" ball was "built in favor of the strikers".
