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McLaren's Lewis Hamilton starts from pole as he targets back-to-back wins in Montreal

The drivers make a clean start with Hamilton pulling clear of BMW Sauber's Robert Kubica and the rest of the chasing pack

With the British driver gradually increasing his lead, Kubica faces pressure for second from Ferrari's Kimi Raikkonen

Drama strikes on lap 19 when Hamilton crashes into the back of Raikkonen in the pit lane taking both of them out of the race

The first to profit from this misfortune is Nick Heidfeld who moves into a 9.3-second lead at the front of the field by lap 25

The 31-year-old German pits handing top spot to Formula One's most experienced driver, Honda's Rubens Barrichello

He stays in front for seven laps before spending 10.6secs in the pits, allowing Red Bull's David Coulthard to briefly take charge

Two more pit stops see the lead change hands again with Toyota's Jarno Trulli and Timo Glock both getting a turn as race leader

Polish driver Kubica finally assumes control of the race during lap 42, giving him a great chance of registering his first Grand Prix win

Further down the field, Ferrari's Felipe Massa edges past McLaren's Heikki Kovalainen to get closer to a place on the podium

Kubica's lead looks more and more secure and with team-mate Heidfeld in second, things look good for BMW Sauber

The pair keep their positions while Coulthard takes third, a result that puts Kubica top of the drivers' championship