IT has been a tough week for rivals of Lewis Hamilton - and that's before the lights even go green at this weekend's Canadian Grand Prix.

Hamilton will be heading to Montreal's high-powered Circuit Gilles Villeneuve chasing a seventh victory - matching that of Michael Shumacher.

And he will be boosted by more horsepower after Mercedes announced it will be unleashing its first engine upgrade of the season.

After dominating the campaign so far, finishing first and second at all but one of the opening six rounds, rivals Red Bull and Ferrari will be casting envious looks down the F1 pit lane after already introducing their own updates.

It will mean the Mercedes team head into the weekend as firm favourites as Hamilton looks to extend his 17 point lead over championship rival and team-mate Valtteri Bottas.

For Ferrari they face another difficult weekend of playing catch up even if the characteristics of the Montreal street circuit are likely to favour their car more than in previous races.

Ferrari's under-fire team boss Mattia Binotto has already provided a bleak assessment of their chances and with Sebastian Vettel already 55 points off the championship lead they need to start winning races soon if they're going to mount a series title challenge.

The real blow for Hamilton's rival though came not on the racetrack but on an American chat show.

Appearing on My Next Guest Needs No Introduction With David Letterman on Netflix, the five-time world champion admitted his desire for success is as strong as ever.

As he chases down Michael Schumacher's record of 91 grand prix wins the Briton revealed he could see himself continuing to race until the age of 38 - the year the German retired from the sport.

'I am ridiculously determined to win,' said the Briton. 'What really drives me, and I feel that the people I race against may lack somewhat, is that fire.'

For those imagining Hamilton wrapping us his career win with a sixth title and swanning off to the Formula One retirement home they may have to reset their expectations.

While it's great news fans who can look forward to enjoying many more years of one of the most successful drivers in the sport, it will be a bitter blow to his rivals who face the ominous task of dethroning the world champion.

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