"I'm excited to try to build on the history I have here", said Hamilton, who leads the drivers championship by 14 points over Ferrari's Sebastian Vettel.
With a victory, he will equal Michael Schumacher's record for the most wins at the Circuit Gilles Villeneuve.
Like Mercedes, both Red Bull and Ferrari are expected to use new engines, but Red Bull technical boss Adrian Newey downplayed expectations, notably because Monaco victor Daniel Ricciardo faces grid penalties for other technical power-unit changes. Whilst many are looking at Leclerc as the future of Formula 1, Stroll is still battling his "pay driver" reputation in his second year of competing.
As the leading customers of Mercedes and Ferrari, Force India and Haas will be taking the fight to Renault, who have been the ever-consistent presence in the top 10 this season.
The Briton can also beat the record he now shares with Schumacher of six poles in Montreal.
4 - Mercedes have been in pole position for four consecutive races in Canada, Hamilton with three and Nico Rosberg with one.
Montreal wasn't kind to Mercedes in 2014 with Hamilton encountering brake issues that forced him to retire after 46 laps.
Hawaii lava destroys more than 600 homes
It has also forced the shutdown of a geothermal energy plant that normally provides about a quarter of the island's electricity. The lava, which has covered more than 2023.47 hectares in this latest eruption, is not only expansive but very thick.
It will be a big weekend at the track, which is celebrating the 40th anniversary of the event's move to the island circuit across from downtown Montreal.
An opening lap crash at turn three involving three cars brought out the only safety auto of the race, but otherwise, the race was as straightforward a race as it could be for Hamilton and Mercedes.
The circuit is particularly tough on brakes, with cars slowing from 320kph to 150 in just 1.6 seconds into the "Wall of Champions" chicane.
Stroll stepped up to Formula 1 with Williams past year to become the first Canadian on the grid since Jacques Villeneuve departed the scene mid-2006.
The Canadian Grand Prix takes place Sunday in Montreal.
That means Fernando Alonso could be set for a disappointing 300th F1 Grand Prix weekend though of course, the Spaniard can never be ruled out.
McLaren are marking the 50th anniversary of the team's first win, by founder Bruce McLaren in Belgium on June 9, 1968.