Rosberg joins select group but title is the target

By Alan Baldwin SOCHI, Russia (Reuters) - 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. 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