Lewis Hamilton insists Nico Rosberg's early 36-point title lead is a "big deal" but says he is up the challenge as he targets his first "clean weekend" of 2016 in Russia. Hamilton's attempts to become a four-time champion have been dogged by problems in the opening three rounds. A combination of poor starts, collisions and reliability problems have left him closer to the Ferrari and Red Bull drivers in the standings than Rosberg, his Mercedes team-mate. Meanwhile, Rosberg yet to be beaten on race day in 2016 and is on a run of six straight victories stretching back to last November. But, as part of a record-breaking 21-race season, 18 rounds still remain with 450 points...
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