Lewis Hamilton is aiming for a record-equalling seventh Formula 1 title this season - but is braced for a tougher test than ever from his rivals. So, who will be the Mercedes driver's biggest threat? F1 is back: New season begins live on Sky Sports Can Valtteri Bottas finally mount a season-long championship challenge? Is this Max Verstappen's year to compete in a strong Red Bull car? And what about Charles Leclerc, and the departing Sebastian Vettel at Ferrari? The Sky F1 pundits have had their say - and you can, too, by casting your vote in the poll below... Valtteri Bottas, Mercedes Karun Chandhok: "I think it's a big year for Valtteri. He's been training very hard, and he knows...
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