Montreal - Lewis Hamilton has driven his Mercedes to the fastest time in the first practice at the 2017 Canadian Grand Prix.
The five-time champion at the Circuit Gilles Villeneuve completed the 4.361km lap in 1min13.809 seconds.
He was about two-tenths of a second faster than Sebastien Vettel's Ferrari. Hamilton's teammate, Valtteri Bottas, was third fastest, just 0.04 seconds behind Vettel.
The opening session was a disappointment for Honda's Fernando Alonso. He stopped on the track with 15 minutes left, reporting heavy steering and a gearbox problem.
Hometown favorite Lance Stroll was 13th best.
2017 Canadian Grand Prix: 1st Practice1. Lewis Hamilton (GBR/Mercedes) 1min13.809 (36 laps)
2. Sebastian Vettel (GER/Ferrari) 1min14.007 (28)
3. Valtteri Bottas (FIN/Mercedes) 1min14.046 (21)
4. Kimi Rikknen (FIN/Ferrari) 1min14.230 (28)
5. Sergio Prez (MEX/Force India) 1min14.578 (34)
6. Esteban Ocon (FRA/Force India) 1min14.785 (35)
7. Max Verstappen (NED/Red Bull) 1min14.861 (19)
8. Felipe Massa (BRA/Williams) 1min15.106 (31)
9. Daniel Ricciardo (AUS/Red Bull) 1min15.441 (23)
10. Daniil Kvyat (RUS/Toro Rosso-Renault) 1min15.658 (26)
11. Stoffel Vandoorne (BEL/McLaren) 1min15.943 (29)
12. Kevin Magnussen (DEN/Haas) 1min16.233 (25)
13. Lance Stroll (CAN/Williams) 1min16.313 (36)
14. Romain Grosjean (FRA/Haas) 1min16.345 (18)
15. Nico Hlkenberg (GER/Renault) 1min16.473 (27)
16. Fernando Alonso (ESP/McLaren) 1min16.521 (13)
17. Marcus Ericsson (SWE/Sauber) 1min16.805 (24)
18. Jolyon Palmer (GBR/Renault) 1min17.004 (26)
19. Pascal Wehrlein (GER/Sauber) 1min17.606 (28)
Unclassified: Carlos Sainz Jr (ESP/Toro Rosso-Renault) (1)