Sebastian Vettel handed three-place grid drop for US Grand Prix

Ferrari's SebastianVettelwill have a three-place grid penalty at Sunday's USGrand Prix, dealing a blow to his hopes of preventing Lewis Hamilton winning a fifth Formula One world championship.

Race stewards decided on the drop afterVettelhad failed to slow sufficiently while red warning flags were waved in Friday's wet practice.

Britain's Hamilton leadsVettelby 67 points with four races remaining and the Mercedes driver will take the title on Sunday if he scores eight points more than the German.

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