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.“As a team, we have built some good momentum in the past two races, outscoring our direct rivals and showing our...
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