Lewis Hamilton has gone fastest in a straightforward opening practice session at Istanbul Park.
The Mercedes man set a time of 1:24.178 on the Soft tyre to go quickest midway through the session, a full four-tenths of a second faster than title rival Max Verstappen.
During the session, it was confirmed that Hamilton will take a grid penalty for this weekend's race.
Verstappen, resplendent in a bespoke white livery as a tribute to Red Bull engine partner Honda, was half a tenth clear of Ferrari's Charles Leclerc in third place.
Mercedes' Valtteri Bottas finished in fourth, with Carlos Sainz underlining Ferrari's initial speed by placing fifth.
The full results from the first practice session for the Turkish GP can be seen below.
Result Free practice 1 - Turkish
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Video: Red Bull show off Honda tribute livery for Turkish GP
Check out the special livery that Red Bull will run for the Turkish Grand Prix, as a tribute to outgoing engine partner Honda.