Mercedes driver Lewis Hamilton has recorded the fastest time in the opening practice session ahead of the Canadian Grand Prix.

Hamilton finished almost half a second clear of teammate and title rival Nico Rosberg as Mercedes dominated in Montreal.

Romain Grosjean was third in the Lotus, while Nico Hulkenberg and Sebastian Vettel were close behind in the Force India and Ferrari respectively.

Fernando Alonso finished ninth in the McLaren, but teammate Jenson Button finished six places further adrift in 15th position.

Full standings:

1. Lewis Hamilton (Mercedes)
2. Nico Rosberg (Mercedes)
3. Romain Grosjean (Lotus)
4. Nico Hulkenberg (Force India)
5. Sebastian Vettel (Ferrari)
6. Felipe Massa (Williams)
7. Daniil Kvyat (Red Bull)
8. Pastor Maldonado (Lotus)
9. Max Verstappen (Toro Rosso)
10. Fernando Alonso (McLaren)
11. Valtteri Bottas (Williams)
12. Kimi Raikkonen (Ferrari)
13. Sergio Perez (Force India)
14. Daniel Ricciardo (Red Bull)
15. Jenson Button (McLaren)
16. Felipe Nasr (Sauber)
17. Carlos Sainz (Toro Rosso)
18. Marcus Ericsson (Sauber)
19. Roberto Merhi (Marussia)
20. Will Stevens (Marussia)