'Rosberg battle psychological warfare'

World champion Lewis Hamilton tells BBC Breakfast that his Formula 1 title battle with Mercedes teammate Nico Rosberg became "psychological warfare".

The 29-year-old says it was the "most intense battle" of his career and his second title "feels like the first time".

Hamilton won the final race of the season in Abu Dhabi on Sunday - his 11th win of the season - to take his first world title since 2008.

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