Hamilton, fourth at the time, headed into the pit lane on lap 16 of this 70-lap race, but the early change of tyres allowed Ricciardo to usurp the Mercedes auto. It is a s*** result for us.
While Valtteri Bottas finished a strong second, the fact is that not only did Lewis Hamilton lose the championship lead as Sebastian Vettel enjoyed a lights-to-early flag victory, but Montreal clearly signalled that Red Bull is now a force to be reckoned with.
The Ferrari driver led every lap of the race on the Montreal street circuit.
Very little in the way of overtaking in Montreal, with the safety auto limiting opportunities at the start and the truncated number of laps limiting them at the end. "This is a track where we should have maximised points - it is not about damage limitation for us".
When asked if Mercedes are confident they can get on top of their problems, Mercedes Team Principal Toto Wolff said: "I'm the opposite of confident".
Both men were transported to the medical centre, and there was enough concern over Hartley to take him to the nearby hospital for further checks.
"Now we are going home with the realisation that Ferrari had the better auto. Even on fuel consumption, they were going like hell all through the race so I think we have to work really hard now".
Having already voiced his displeasure with a lack of racing action in Monaco, Hamilton had more criticism for the state of Formula 1 following a lackluster fifth place finish in Montreal.
Running against rivals who had upgraded power units, unlike Mercedes, Hamilton was unable to match the pace or rhythm on a circuit he touts as a favourite and where he has won six times including his first in 2007.
"I was quite happy with my first run in Q3 but I knew there was something more in the auto for the first part of the lap", Vettel continued. From the start, all of a sudden I was down on power and my engine was saying it was over-temperature and I couldn't get the temperatures down.
"It is definitely more fun when you have more engines".
"You can't take anything for granted and think it will be a walk in the park".
Hamilton has certainly had a lot to moan about, although he will no doubt turn that frown upside down if he returns to the winner's circle.