ART Grand Prix driver Stoffel Vandoorne was in a league of his own in GP2 practice at Sochi, topping the session by almost seven tenths of a second.
GP2 champion-elect Vandoorne was into the lead at halfway point before lighting up the screens with a 1m45.326s with 12 minutes remaining.
His best time from the session, which ran on a cool yet dry track, was quicker than the 2014 pole record from the inaugural Sochi GP2 round, jointly held by Vandoorne himself and Arthur Pic.
It was Pic who finished this session as best of the result, 0.699s off Vandoorne in his Campos Racing machine.
Pic's teammate Rio Haryanto was third, with Mitch Evans fourth for local team Russian Time - and rookies Alex Lynn, Pierre Gasly and Sergey Sirotkin narrowly behind the Kiwi.
Manor Formula 1 driver Alexander Rossi was eighth, with Raffaele Marciello and Vandoorne's teammate Nobuharu Matsushita making up the top 10.
Debutant Dean Stoneman was two seconds off the pace and finished the session in 19th, beating five series regulars.