for the full Russian Grand Prix FP2 times
Lewis Hamilton returned to the top of the timesheets during second free practice for the Russian Grand Prix, while Sebastian Vettel and Ferrari struck more trouble in Sochi.
Having trailed team-mate Nico Rosberg in FP1, Hamilton was on form in the warmer second session, his super-soft lap offering up a 1min 37.583secs benchmark, putting him seven tenths clear of Sebastian Vettel despite enduring more than one off as he found the limit of the slippery Sochi Autodrom venue.
FP1 pace setter Rosberg, meanwhile, dropped nine tenths to Hamilton this time, though the margin can be explained away by the championship leader suffering with traffic on his quickest lap.
Despite going second fastest, Vettel only completed 10 laps after his Ferrari ground to a halt on the home straight, the German complaining of electronic problems on the SF16-T and marking another technical issue to decipher for the under pressure Ferrari team.
Kimi Raikkonen enjoyed a trouble-free day as he followed up behind Rosberg in fourth place, but more than a second down on Hamilton, while Daniel Ricciardo, Valtteri Bottas and Daniil Kvyat followed up as 'best of the rest' in fifth, sixth and seventh.
Having been just outside the top ten in FP1, McLaren crept up the order with Jenson Button eighth and Fernando Alonso tenth in their Honda-powered MP4-31s, the pair split by the Williams of Felipe Massa in ninth.
Elsewhere, Kevin Magnussen returned to the cockpit for Renault in 15th position, ahead of Jolyon Palmer in 18th, while Pascal Wehrlein suffered a late stoppage when his Manor coasted to a stop with mechanical problems in the final minute.