Video: Claire Williams underlines Massa's crucial role this year

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Felipe Massa went through a revolving door this winter, retiring from the sport before jumping back in after Valtteri Bottas' move to Mercedes.

Williams apparently made the 35-year-old Brazilian an offer he couldn't refused, premised on the fact that the Grove-based outfit required a fast and experienced driver to handle a season of change and development with the introduction of F1's new rules.

In the video below, Claire Williams underscore Massa's role of lead driver this season, with expectations running high.

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