Nico Rosberg joined an ultra-select group of Formula One drivers with his seventh win in a row for Mercedes at the Russian Grand Prix on Sunday but the German will remain the odd man out for some time yet. Only four drivers since the championship started in 1950 have won seven races in a row and only four have triumphed in the first four rounds of a season. Just one, Rosberg's compatriot Sebastian Vettel, has won more than seven in a row — nine for Red Bull in 2013 when he won his fourth championship. All, bar Rosberg, were title winners but he is well on the way with a 43-point lead over triple champion, team mate Lewis Hamilton, who suffered power unit problems in both qualifying...
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