Sutton Images Enlarge Nico Rosberg admits he and Lewis Hamiton are walking a "fine line" in their bid to win the world championship but still both keep Mercedes at the centre of their priorities. Rosberg currently leads Hamilton by 14 points after Germany despite having four victories to the Brit's five. Much has been made of the pair's relationship, which stretches back to their karting days, and Rosberg thinks both are on the limit of what is acceptable as team-mates and what is not. "It's difficult, very difficult," Rosberg said when asked how he found managing the relationship with Hamilton. "Internally we need to find the balance also because in the first...
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