Lewis Hamilton has secured back-to-back victories in this year's Formula 1 Championship by winning the Canadian Grand Prix on Sunday, despite a bad start.

The Brit was involved in a tense strategic battle with Sebastian Vettel's revived Ferrari, which looked in control of the race after vaulting into the lead from third on the grid with a blistering start.

Ferrari, however, surrendered the lead by pitting during a caution period, and Hamilton - doing one pit stop to Vettel's two - soon took charge of the race.

The 31-year-old, who won the Monaco Grand Prix a fortnight ago, cut his title deficit to Nico Rosberg, who ended fifth at Montreal's Circuit Gilles Villeneuve, to nine points.

Vettel finished second in the race, while Valtteri Bottas sealed a surprise podium for Williams and teenage Spanish GP winner Max Verstappen ended in fourth place.

1. Lewis Hamilton (Mercedes)
2. Sebastian Vettel (Ferrari)
3. Valtteri Bottas (Williams)
4. Max Verstappen (Red Bull)
5. Nico Rosberg (Mercedes)
6. Kimi Raikkonen (Ferrari)
7. Daniel Ricciardo (Red Bull)
8. Nico Hulkenberg (Force India)
9. Carlos Sainz (Toro Rosso)
10. Sergio Perez (Force India)
11. Fernando Alonso (McLaren)
12. Daniil Kvyat (Toro Rosso)
13. Esteban Gutierrez (Haas)
14. Romain Grosjean (Haas)
15. Marcus Ericsson (Sauber)
16. Kevin Magnussen (Renault)
17. Paschal Wehrlein (Manor)
18. Felipe Nasr (Sauber)
19. Rio Haryanto (Manor)
20. Felipe Massa (Williams)
21. Jolyon Palmer (Renault)
22. Jenson Button (McLaren)