Hamilton without regular race engineer Bonnington in Mexico

Lewis Hamilton's bid to tie up a sixth Formula 1® world title will have to be completed in Mexico City without the aid of race engineer Peter Bonnington.

Hamilton must outscore Mercedes team-mate Valtteri Bottas by at least 14 points in Mexico to secure a third successive title with three rounds of the season to spare.

However, he is without regular engineer Bonnington, who will miss the Mexico and United States races as he undergoes a medical procedure, according to the official Formula 1® website.

Performance engineer Marcus Dudley is replacing Bonnington for the weekend's Grand Prix at the Autodromo Hermanos Rodriguez.

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