Team boss John Booth has warned his Marussia team that it has to finish of rivals Caterham on track in the final two races of the season to ensure it wraps up tenth in the constructors' championship.

Marussia moved ahead of its rivals thanks to Timo Glock's twelfth place finish in Singapore but then suffered a real scare in Abu Dhabi last weekend after Heikki Kovalainen ran twelfth for Caterham before being shuffled back a place towards the finish.

With it unlikely that either team would achieve a top twelve result on speed in either Austin or at Interlagos, the fight for tenth could be decided on which team is in the best position to take advantage of any attrition ahead and for that reason, Booth said his team had to make sure it was ahead of Caterham on track in the final two rounds of the year.

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"Last weekend's race in Abu Dhabi had us on the edge of our pitwall seats at various points, as it reminded us that to hold on to 10th in the Constructors' Championship, we cannot control what happens further up the field, ahead of our own private duel with Caterham," he said. "We have to continue closing that gap and find the momentum to get ahead of them on track.

"We've come very close in recent races, despite their KERS-advantage, and we'll remain in dogged pursuit of this objective right up until the chequered flag in Brazil."

With the Circuit of the Americas being a new venue, both Glock and Charles Pic will be competing in Texas for the first time and Pic said he was excited about the maiden race at the venue.

"The US GP is high on the list of races I have been most looking forward to in my debut season," he said. "From what I have seen, the track is spectacular and the layout seems very interesting from a technical point of view. We spent some time in the US - in New York actually - in the summer after Canada, helping to promote the new race. The reaction amongst the fans and media was overwhelming and although I didn't get to race in the States before, they certainly look happy to have F1 back. It will be great to be a part of that.

"As for our objectives, there is a lot to think about as this is a new race, but we need to keep pushing hard to maintain our current momentum versus Caterham - in qualifying and the race - and ensure we leave town with tenth in the Constructors' still firmly in our grasp. Should be a great weekend."