Mercedes' 'Achilles heel' was exposed in Austria, team boss Toto Wolff has admitted. 'We knew it would be a difficult race for us,' said Valtteri Bottas. 'In the end it was even worse than we expected.' After a run of eight consecutive wins for Mercedes, it was Red Bull and Ferrari finishing one-two in Austria as the silver cars battled to control overheating. 'We already opened the bodywork as much as we could. The only other way to get the temperatures down was lift and coast,' said Wolff. 'We knew we had a problem with the chassis cooling, that is our Achilles heel. But when we lose, that's really the best way to learn.' Lewis Hamilton, the runaway championship leader, said he was also...
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