Mercedes motorsport boss Toto Wolff says the team has to maintain its recent momentum in this weekend's United States Grand Prix at the Circuit of the Americas.

Podium finishes for Nico Rosberg in the last two races have helped the team to move into second place in the constructors' championship ahead of Ferrari, with just two races left to run in 2013.

Speaking ahead of the Texas race, Wolff admitted that Mercedes had hit form at just the right time but needed to keep its recent run of form going if it wanted to secure the runner-up slot behind Red Bull in the standings.

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"As a team, we have built some good momentum in the past two races, outscoring our direct rivals and showing our determination to hold on to second place in the Constructors' Championship," he said. "That's our clear focus and we have been working hard since Abu Dhabi to see how we can give the drivers a more raceable package for the final leg of the season.

"Nico will be out to maintain his strong finishing record, after two consecutive podiums, while Lewis showed last year that he is very comfortable on this circuit. It will be an intensely hard-fought weekend for the entire team."

Rosberg, who has been the closest challenger to Red Bull pair Sebastian Vettel and Mark Webber in recent races, said he was hopeful of another strong showing to keep Mercedes' bid for second place on-track.

"The first race at the Circuit of the Americas last year was great and it immediately became one of my favourite weekends of the year," he said. "The track has a similar layout to Suzuka in the first section and is very fast with good long straights and the DRS zone for overtaking. The big uphill section at the start of the lap is very unique as you're looking straight up into the sky and then suddenly you're in the middle of the corner.

"We've built up some momentum over the last couple of races and I hope we can have another good weekend in Austin and maintain our position of second place in the Championship."