Valtteri Bottas: Big opportunity but challenge of his life at Mercedes

Valtteri Bottas faces the opportunity and challenge of his life following his switch to Mercedes for 2017.

After four seasons of solid performances with Williams, the 27-year-old Finn has been rewarded with every driver’s dream – a seat with the best team in Formula 1.

Read more: http://www.bbc.com/sport/formula1/38640410