Aug.4 (GMM) After McLaren and Ferrari fielded cars with winning pace in July, Red Bull could be challenged even more once this month's summer break ends.

That is the view of Mercedes' Ross Brawn, who thinks the championship is likely to heat up at Spa-Francorchamps and beyond.

"It's impossible to predict what will happen from Spa," he is quoted by Brazil's O Estado de S.Paulo, "but I think that as we saw Ferrari and McLaren managing to make their cars faster over the last three races, they are likely to improve even more."

Agreed Renault's sporting director Steve Nielsen: "Because Ferrari and McLaren are developing the aerodynamic exhaust later than Red Bull, they have more potential to improve it."

Toro Rosso's veteran technical chief Giorgio Ascanelli, however, disagrees, and HRT's Geoff Willis explains: "I know Adrian (Newey) well from Williams and how he works when the opposition gets tougher.

"I predict they (Red Bull) will come back to dominating the races, although not like early in the season because the competitors have come to understand some of their solutions."

While McLaren's drivers won the last two grands prix, Ferrari's Fernando Alonso would have won the championship by three points over Sebastian Vettel if the season consisted only of Valencia, Silverstone, the Nurburgring and Hungary.

Red Bull, meanwhile, might struggle on the high speed sections at Spa and then Monza.

"That's right, those two tracks are not exactly our best ones," Mark Webber told laola1.at in Austria this week.

"So we need to limit the damage and then attack again when we can," added the Australian.

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