Leclerc's time of 1:30.354 was a quarter of a second ahead of his teammate and a second quicker than both
Valtteri Bottas and
Lewis Hamilton.
The
Red Bull's of
Max Verstappen and
Pierre Gasly finished in fifth and sixth, with Verstappen seemingly having a hydraulic issue with his car before practice even got under way.
Towards the closing stages of FP1 there was an incident between Hulkenberg and
Antonio Giovinazzi, in which the Italian was sent airborne.
Both have been summoned to the stewards for the incident and further investigation.