Whilst admitting that a repeat of his Monaco points finish might be harder to come by in Canada, Jenson Button is not ruling out another slice of luck in the final laps lottery.

The Briton has made a habit of snatching unlikely results from awkward places in Montreal, not least the victory he claimed in 2011 having, at one point, been dead last. Last season was a similar story, with a gain of four places late in the day, but Button knows that luck can just as easily desert you in the middle of the St Lawrence, with results of 16th and twelfth sandwiched between those better days.

"I'm expecting a slightly tougher weekend than Monaco," he confirmed, having grabbed McLaren-Honda's first points of the season in the Principality last time out.

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"Canada is a great circuit and there's always a lot of action here, but it's not a predictable race whatsoever. Last year, I started the second-to-last lap eighth and finished fourth. I overtook two cars at the hairpin and two cars crashed at turn one on the final lap, so anything can happen. Who knows what the weekend is going to throw at us....

"I think we've just got to get stuck in, get on with our plan and see where we are. Obviously, there are long straights here, and while I think we've made some positive improvements, whether it's enough or not we'll have to wait and see."

Button and team-mate Fernando Alonso have been playing a lottery at every round this season, with reliability a major bugbear for the McLaren-Honda partnership in its first year back together, and the Briton isn't able to predict just how the team will fare this weekend.

"With the issues we've had in races - my issues in Bahrain and Fernando's the last two races - we all want performance, but you've got to be able to get to the end of the race as well.

"With these cars, you're just on a knife-edge the whole time - it's so easy to lock tyres, so easy to get a snap, and it's a really, really tricky circuit. It's a real balance, and a difficult balancing act because we all want to move forward. Every race, we're asked questions about 'where are you going to end up?' and 'how much quicker are you going to be?' but it's a tricky one trying to balance it all."