Red Bull boss Christian Horner believes F1 driver Mark Webber is fitter and more motivated than ever for this season's tournament.

Horner said Webber is more determined than ever to secure the championship title for himself and the team after narrowly missing out on it last year.

Webber's contract with Red Bull expires at the end of this season but Horner explained they have agreed to look at the contract on a yearly basis at this point in Webber's career, to ensure he is maintaining all his competitive qualities.