Paul Hembery: "As has so often been the case in the past in Canada, today was all about rain: which is frequently what makes this such an exciting and unpredictable race. The key to a quick time here today was getting the speed out of the intermediates. The timing of each qualifying lap was crucial as well, with Valtteri Bottas and Williams in particular doing a brilliant job.
"As tomorrow now looks set to be dry, it will be interesting to see how the different strategies play out, with most drivers still having plenty of new tyres available, thanks to the mainly wet conditions up until now. In addition, the teams did not have much opportunity to run on the slick tyres so far this weekend, so they don't have a lot of fresh data at their disposal. If it's dry, as most people expect, the drivers can start on whichever compound they choose and this opens up the possibilities of different strategies even further."