MONTREAL, Canada -- It's going to be hot at the Circuit Gilles Villeneuve on Sunday, with the mercury expected to tip 29C come the race start. That is going to cause issues for anybody starting on the soft tyre, which was melting after just a handful of laps in slightly cooler temperatures on Friday.
It's no surprise, then, that Ferrari and Mercedes opted to complete Q2 on the medium tyres so that they would start on the same compound in the race. Expect those who didn't make Q3 to do the same before a single stop to switch to the hard tyres until the end of the race.