Lewis Hamilton says turning around the 43-point deficit on Mercedes team-mate Nico Rosberg is a 'big challenge' but has been given confidence from his squads' efforts in recent weeks.

A difficult start to the season with reliability woes has seen Hamilton lose out while Rosberg has taken full advantage with four wins from four races.

Despite the mechanical gremlins which have hit the defending F1 world champion he has only missed out on the rostrum on one occasion - in China when he started last and was involved in an opening lap clash - and Hamilton feels with a trouble-free race he can battle for victory this weekend in Barcelona.

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"Every weekend, we've got the car into a great place setup-wise - I just haven't been fully able to exploit it," Hamilton said. "So the glass is half full for me. It will be a big challenge but there's a long way to go with 17 races left and, if the last four are anything to go by, there's a lot more still to come from us.

"The team has been on it 24/7 since returning from Russia so I'm confident they'll get to the bottom of the problems we've been having. I know I'm still quick. I've known that since day one in testing and, when I've had clean air and a damage-free car this season, I've shown it on track. I head to Spain confident of a good weekend."

Hamilton says he's enjoyed taking time away from F1 to refocus after the Russian Grand Prix, with the British driver appearing at the Festival of Speed in Barbados, and has reiterated his faith in his Mercedes crew to get on top of its ongoing reliability troubles.

"It's been good to have a break after Russia," he said. "Over time you reflect on each race weekend and what you might have done differently, so you can learn from each experience and move on.

"I'm really proud of the guys in the garage: we've had a hard time but they're doing a fantastic job and I'm really happy with how we've been working together."