Mercedes Formula One driver Lewis Hamilton of Britain celebrates with his trophy after winning the Russian F1 Grand Prix in Sochi, Russia, October 11, 2015. REUTERS/Grigory Dukor
SOCHI, Russia (Reuters) - The Formula One constructors' championship is won for the second year in a row, and Lewis Hamilton is on the brink of his third world title, but lack of reliability is still giving Mercedes plenty to worry about.
The champions have suffered three retirements in four races and the throttle failure that sidelined Nico Rosberg in Russia on Sunday took the gloss off another triumphant afternoon for the team.
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