Mercedes driver Nico Rosberg believes he can turn it around and overhaul Championship leader Lewis Hamilton, although he concedes he does have to start winning, beginning with this weekend's Japanese Grand Prix.

After Hamilton suffered his first retirement of the season in Singapore last Sunday, due to a technical problem, Rosberg closed the gap from 53 points to 41, with six races remaining and a total of 150 points up for grabs.

Quizzed on if he feels he can still catch his team-mate ahead of the 14th round in the 2015 F1 World Championship, Rosberg replied: "Yeah, six races to go - and my focus really is on the race itself [here] because I need to win. To go in the right direction I need to win races and so I need to try and start now and win Suzuka. So that's what I'm focusing on, then once I manage that I will think about the rest."

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Pressed on if he knows what he needs to do to beat Hamilton, Rosberg replied: "I just have to do a great job and get my weekends together and be at my best. That's what I'm aiming for anyway, it's so small that it just takes Lewis to have a bit of a worse weekend and me to have a bit of a better one and then it will be enough to turn it around.

"It's been within a tenth our qualifying now for the last races - Monza is difficult to judge because of different engines but it has been very, very close so it doesn't take much."

Rosberg also said he wasn't frustrated that the race where Hamilton retired was the one that Mercedes wasn't in the hunt.

"I understand why you'd say that but it is for me a bit far-fetched, that idea, to think of it in that way. I didn't think of it that way, I thought about it simply in the way that I made up many of the points I lost in Monza [when my engine let go], closed down the gap which is definitely going in the right direction.

"That's it, I didn't think more than that."

Meanwhile, Rosberg added that while Sebastian Vettel and Ferrari are a danger, it is Hamilton he is gunning for.

"Well Sebastian's a threat for sure and we're all keeping an eye on him, definitely, and on Ferrari in general because they have been very strong at times this year and they have been our closest competitor. They are capable of anything so we need to be careful," Rosberg confirmed.

"But championship-wise I'm not looking backwards, I'm just looking forwards because if it comes to that then third or second is not really a difference to me. I'm going for first place this year - second I've already been last year - and so only first place counts.

"I'm just looking forwards, so Sebastian being a couple of points closer or further away doesn't really make a difference for me.

"I'm just looking at the 41 points to Lewis."