Lewis Hamilton said his new Mercedes chassis had transformed his competitiveness in Sunday's United States Grand Prix, enabling him to finish fourth. "The car was night and day different compared to where it was in Abu Dhabi, so I'm sure the new tub helped," he said. "I'm really just so happy that I could contribute and get some points for the guys. They've been working so hard all year and they've had so many difficult races in this half of the season. "To finally have a half decent qualifying, move forward, utilise the tyres and have life left in them, makes me really, really happy." Hamilton had struggled to match the performance of his Mercedes teammate Nico...
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