Aware that his chances of beating Mercedes team-mate Lewis Hamilton to the 2015 F1 drivers' world championship are slipping away, Nico Rosberg says he is focusing on having fun while trying to win races for the remainder of the season.

The German was already on thin ice before the F1 circus headed to Russia, but a sticking throttle in the race not only handed his rival the victory but a DNF further dented his own aspirations, leaving him 73 points adrift of top spot and now behind Ferrari's Sebastian Vettel as well as Hamilton.

Before the problem struck, Rosberg had been the class of the field in Sochi, pacing final practice after Friday had largely been lost to circumstances beyond the teams' control and then claiming only his third pole of the season, albeit his second in succession after Suzuka. Unlike Japan, the German was not muscled out of the lead on lap one, and continued to head the field until lap six, when he was forced to slow and eventually head back to the pits.

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Despite his misfortune, Mercedes was able to claim its second consecutive constructors' crown in Russia but, while his individual title hopes might be fading, Rosberg has again refused to cede the dream completely.

"Being back at the factories, and seeing everyone so happy, was just the boost I needed after a tough Sunday in Russia," he admitted, "The whole team deserves this moment and what we've achieved together is really amazing. Hopefully, this is just the start.

"With four races left and a big gap to Lewis, it's clear that the title is a long shot for me now, but it's not in me to give up or back down, so I'll be pushing flat out to the end - and, hopefully, having some fun out there in the final few rounds this year."

Last year's second place finish in Austin stands as Rosberg's best at the Circuit of the Americas, and he is looking forward to returning with the aim of going one better this weekend.

"I really want to enjoy the next races, as our Silver Arrow is such a great car and gives me the chance to end the year with a few more wins," he pointed, out, "Austin is definitely somewhere that you can have fun too, so I'm looking forward to going back there as it's a great track to drive.

"I got pole there last year, and I'm coming off the back of a really strong weekend in Russia in terms of my performance, so if I can repeat all of that then I'll be in a good position. Bring it on!"