Lewis Hamilton reckons Ferrari are "half a second" faster than their pitlane rivals based on the evidence of pre-season testing in Barcelona.
Mercedes' world champion was speaking on Friday as out on the circuit Sebastian Vettel set the fastest lap time of the winter.
"This is going to be the toughest battle yet. Ferrari, their pace is very good at the moment," the Briton told a press conference.
"I think the gap is potentially half a second, something like that," said Hamilton, before quickly adding: "I have the confidence I have the team to do the job."
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