Ferrari go fastest in Russia practice as many struggle for grip

Although the sun was beating down on the Sochi circuit, it was a scrappy day of free practice for many teams and drivers. Sergey Sirotkin was in at Renault, celebrating a Friday appearance in front of his home crowd, but it ended with his engine switching off. Esteban Ocon also suffered in the engine department in a slightly different way, the pink engine cover on his Force India flew off the back of the car as he was braking.