Robert Fernley: "We obviously still have a lot of work to do ahead of qualifying, but from a learning perspective we’ve achieved a lot today.”
Fernando Alonso: "The car feels consistent and easy to drive, and it’s giving me the confidence to push it to the limit."
Daniil Kvyat: "There is definitely potential and things are looking better compared to Melbourne,"
Both Sauber C34-Ferraris ran without any major issues.
Lotus F1 Team opened-up strongly but Romain Grosjean experienced a loss of power in the afternoon.
Nico Rosberg topped the times during the morning session, with Lewis Hamilton claiming top spot in the afternoon.
The real race pace will be known only on Sunday.
Manor Marussia finally made it onto the track in Malaysia as both Will Stevens and Roberto Merhi ran the revamped car for the first time in free practice at Sepang.
Sebastian Vettel believes Red Bull and Toro Rosso could join the fight behind Mercedes in this weekend's Malaysian Grand Prix.
Both silver arrows are in the top three spots on the timesheets with Ferrari's Raikkonen separating them.