Championship leader Lewis Hamilton says talk of sealing his fourth Formula 1 world title at the US Grand Prix is "silly" given Ferrari's generally strong form. Ferrari has been potentially competitive enough to win each of the last three grands prix, but has let itself down through mistakes and poor reliability, allowing Hamilton to extend a 59-point advantage over chief F1 title rival Sebastian Vettel. Hamilton can clinch the championship by winning this weekend's Austin F1 race, provided Vettel finishes sixth or lower, but the Briton believes such an outcome is unlikely. "Talk of the championship win here is silly really," he said. "Sebastian, you cannot expect...
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