• Team-mate Nico Rosberg 48 points behind in title battle• Mercedes hope to wrap up constructors’ championship in SochiLewis Hamilton’s first retirement of the season in Singapore was promptly consigned to the dustbin of history when he followed it with a win at the last round in Japan, and he was buoyant and determined to continue his stranglehold on the drivers’ championship in Russia.Hamilton won in Sochi last year at the circuit’s first grand prix, with a peerless run from pole to flag without surrendering the lead, a feat he has also achieved in the championship battle with his Mercedes team-mate Nico Rosberg, who trails him by 48 points with five races remaining.