Hamilton in 'race mode' for start of F1

Formula 1 driver Lewis Hamilton says he is back in "race mode" ahead of the start of the new season.

Following day one of the final pre-season test in Barcelona, the Mercedes racer reveals there are some "positives" to his car and the team are working on "reliability issues".

The 28-year-old has switched to Mercedes this season following four years with McLaren.

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