The first day of practice for the Russian Grand Prix suggested the race may not be a simple case of 'advantage Mercedes' as had been predicted.
Honda believes its engine concept for 2017 is correct despite McLaren suffering a disastrous start to its third season with their power units.
Ferrari demonstrated an impressive turn of pace on Friday in Sochi. Are they the pace setters this weekend, or do Mercedes have something in reserve?
It was a frustrating day for Romain Grosjean but he at least got to do more laps than Sergey Sirotkin. Here's Friday's team radio highlights.
Sebastian Vettel set a new record lap time around the Sochi Autodrom as he kept Ferrari on top in the second practice session for the Russian Grand Prix.
Stoffel Vandoorne will become the first driver this year to receive a penalty for changing parts of his power unit.
Follow the 2017 Russian Grand Prix second practice session on F1 Fanatic Live.
Kimi Raikkonen's Ferrari led the Mercedes of Valtteri Bottas by just four-hundredths of a second in first practice for the Russian Grand Prix.
Pictures from the first day of practice for the 2017 Russian Grand Prix.
Follow the 2017 Russian Grand Prix first practice session on F1 Fanatic Live.
In the round-up: Alonso says he doesn't regret Ferrari exit • Only Honda behind Mercedes - Perez • Vettel defends Raikkonen