For an hour or so Diego Costa had the look of a striker who might have been nursing a hamstring problem which was preying on his mind, eating away at his confidence and preventing him from firing on all cylinders.
Then, he crashed a header past Brad Guzan to score Chelsea�s second, his eighth of the season, created the third for Willian and with the result secure left the field to a standing ovation, once again.
His 20-minute burst had done the trick and Aston Villa, still without captain Ron Vlaar, had been crushed by goals from three Brazilians � Oscar scored the first � and their positive start to the campaign has taken a turn for the worse since the club was struck by a virus.
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