Lewis Hamilton has ended the opening practice session of the Canadian Grand Prix weekend on top of the timesheets, as Mercedes holds a large gap to its rivals.
Hamilton's lap time of 1:12.767 was almost one second faster than Charles Leclerc in P3, while the second Mercedes of Valtteri Bottas was in second place, behind his teammate.
However, the day didn't end smoothly for Bottas, as he was hit with a reported loss of fuel pressure in the final minutes of the session.
The day was slow to get underway, as the track surface was noticeably dusty - all drivers appeared to be struggling for grip throughout the 90-minute session.
The dust was still present on the racing line when the chequered flag fell, however there were plenty of cars out on the circuit to sweep the dust and debris up.
Max Verstappen ended the session in fourth place, splitting the Ferrari duo and Vettel was fifth, 1.1 seconds down on pace-setter Hamilton. Vettel's former teammate Kimi Raikkonen was sixth, 0.050s slower than the German.
Raikkonen's teammate Antonio Giovianzzi's hit the wall on the exit of Turn 9, losing the rear and damaging his rear suspension which put him out of the session.
In high spirits after three consecutive top ten finishes, Carlos Sainz was seventh for McLaren, ahead of Daniel Ricciardo by a tenth and a half.
Sergio Perez was ninth in the Racing Point car while Haas, whose car is running without Rich Energy logos this weekend, rounded out the top ten with Kevin Magnussen.
Nicholas Latifi, who made his first FP1 appearance of the year, set a lot of laps early on for the Grove squad, while other teams opted to wait for the track to clean up. The Montreal born racer ended the session on 20th.
Pierre Gasly didn't break into the top ten, as he concluded opening practice in 13th, one second down on teammate Verstappen.