Valtteri Bottas has been dropped by his main sponsor Wihuri, after being described as "weak" in 2018 as he embarked on a winless campaign for the constructors' champions. Wihuri were Bottas' biggest backers and their withdrawal puts his Mercedes future into further doubt. Although the Silver Arrows are not reliant on sponsors' income as some other teams on the grid increasingly are, the move will further damage Bottas' reputation ahead of a make-or-break 2019 campaign. The Finn became just the third driver in the 21st Century to go without a win in a season that his team won the constructors' title and has been ordered by Toto Wolff to be more of a match to Lewis Hamilton this...
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