The Hungarian Grand Prix provides the best chance for Ferrari's rivals to end Michael Schumacher's domination, according to Jaguar star Mark Webber.
Will Ferrari's tyres suit the dusty Hungaroring track?
Schumacher, who was eighth in Hungary last year, will break his record of 11 victories in a season if he wins.
"Ferrari are in better shape than last year so I still predict they're going to be very strong, but it's going to be a very good race," Webber said.
"He's going to have to work for it, as he has done for most of the year."
Speaking to BBC Sport, Webber predicted the Hungarian race would see "probably the smallest margin" between the world champions and their rivals.
That is because the track surface of the Hungaroring is believed to reduce the advantage held by Ferrari's Bridgestone tyres over the Michelins used by all their major rivals.
"It's going to be down to the tyres again," Webber said.
"Michael got lapped there last year by Fernando (Alonso), who had an amazing race.
"Renault's car was very well suited to that particular circuit and Ferrari had a bit of an off-day, which doesn't happen that often. Ferrari were exposed and they got punished very heavily.
"At Hockenheim (the last race) Michael was fortunate with some of the retirements around him and Jenson (Button) starting a bit further back.
"There have been some easy Grands Prix for Michael, but he has had to work very hard at some races this year."
Webber said he hoped Jaguar could continue their form from the German Grand Prix, where he finished in the points in sixth place.
"In Hockeheim it was a very enjoyable race, it was good to be up there racing with some very good teams," Webber said.
"Jaguar have done a very good job with the car this year, particularly in this middle part of the year with both cars finishing.
"(Team-mate) Christian (Klien) is doing a very good job and it's working out well for us.
"It would have been nice to have had more reliability at the beginning of the year but we hope we can continue this run into the last part of the European season."