Fernando Alonso fears this season's formula one world championship could today be decided in court

• Former world champion says diffuser is unfair
• Spaniard says ruling in Paris is crucial to season's outcome

Fernando Alonso fears this season's formula one world championship could today be decided in court when Ferrari, Renault, BMW Sauber and Red Bull face Brawn GP, Williams and Toyota at an International Court of Appeal hearing in Paris.
The case centres around the diffuser - an aerodynamic body part that aids performance - at the rear of the cars belonging to the three defendants.In the opening two grands prix in Australia and Malaysia, the three teams have a clear performance advantage, with Brawn GP's Jenson Button winning both.
If the judges deem the part is illegal, they have the power to overturn those two race results, potentially wiping Button's two victories from the record books.
However, the double former world champion Alonso believes if the judges side with the diffuser teams, it will be difficult for any of the other seven to win either the drivers' or constructors' title."It's a complicated issue, but the championship could be more or less decided," said Alonso. "If the diffusers are legal, the Brawns are going to be nearly unreachable for any other team."
The major concern for Ferrari and the rest is that if they do lose, they will be forced into a radical redesign of their cars as the diffuser affects a number of areas."You have to work on the whole car," explained the Renault driver.
"It's not just about adding the diffuser and suddenly the car is a second quicker. The diffuser makes you go fast if you have a new front end, new sidepods, a new engine cover. You have to rebuild the whole car, and that would take a lot of months."