Lewis Hamilton returns to the scene of his maiden F1 victory still still amazed he won last year's Canadian Grand Prix.

The McLaren-Mercedes driver regained the lead in the world drivers' championship two weeks ago with the sixth grands prix win of his short career at Monaco.

Hamilton emerged victorious from an incident-strewn race in Montreal 12 months ago, but ahead of Friday's first practise session, said: "I got my first pole position and I was happy with that but I wanted to convert it to a win."

He added: "Then I had all these safety cars pull out and I had this big gap, safety car would come out and then another gap and another safety car and so I was thinking 'Am I really supposed to be winning this race?'

"But I still managed to pull it off - it was a spectacular win and I was thrilled about it.

"To have my first grand prix win in my first grand prix season and after such consistent races beforehand, even now, looking back on last year, I don't even know how I did it. It's so hard to be consistent."