Verstappen arrived in Montreal under attack from all corners, after an incident-filled start to the season in which the 20-year-old reach the podium once in six races, while Ricciardo has recorded a pair of wins.
In the final five laps, Hamilton pushed Ricciardo hard in the battle for fourth but the Australian - victor at Monaco last time out - just held on with the four-time world champion forced to relinquish his standings lead as he recorded his lowest placing of the season. The Scuderia are the most successful team at the Circuit Gilles Villeneuve with 11 wins but they had not had a victory here since Schumacher won in 2004. After leading all three practice sessions, Red Bull driver Max Verstappen will start third, alongside Hamilton.
Hamilton's bid for a record-equalling seventh victory in Montreal was compromised from the start of the race with his engine suffering from cooling problems.
"I think it was just a combination of things", he admitted.
Stroll, 19, was in is second Canadian GP.
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Both took heavy damage in the contact and careened across Turn 6 and into the far barriers, where both their races ended. "When we got to qualifying, honestly we knew it was going to be very close as it was, but in my heart, I truly feel like we had the pace to lock out the front row, or at least I had the pace to be on the front row".
Hamilton retains a slim lead over Vettel in driver standings and will likely challenge the German when racing begins in earnest.
"We are not there yet and we need a little more time to get it all together, but I expect we will be there tomorrow (Saturday for qualifying)". "But it showed in Monaco that we have a great vehicle".
"We were briefly talking about what we wanted to do, trying to figure everything out".
We'll give you a few pointers shortly in what to look out for in today's race but it could once more be an interesting one for strategy, with how long each driver can make the hypersoft and ultrasoft tyres last a critical aspect. Every single lap I was kind of on the edge just waiting for the power to drop away and disappear.
"I think we have a really good auto".