Nico Rosberg insists he still faces a tough fight from Mercedes team-mate Lewis Hamilton for the title despite winning the season's first four races. Rosberg leads the British world champion by 43 points after Sunday's Russian Grand Prix. "I am well aware Lewis is going to bounce back when he has a clean weekend and it will be the usual tough battle against him," the German said. "Sport is all about ups and downs. I just need to mentally prepare." Victory at Sochi was Rosberg's seventh in a row, dating back to last October's Mexican Grand Prix, the race after Hamilton had clinched his third world title. Only three other drivers in F1 history have achieved that feat -...
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