Rain had fallen all morning in Montreal to provide a collection of small puddles across the circuit, whereas the chilly situations yielded a observe temperature of simply 17.5 levels Celsius on the opening of the session.
Haas pairing Nico Hulkenberg and Kevin Magnussen had been first to discover the damp observe with the complete moist tyre, Hulkenberg setting a 1m34.889s moments earlier than Magnussen kicked off with a 1m34.797s.
The pair improved on their subsequent tour, however Alonso’s opening gambit of a 1m32.217s was sufficient to elevate him to the highest regardless of coming throughout a “blind” Yuki Tsunoda on the exit of the hairpin.
Esteban Ocon collected a 1m31.428s to maneuver to the highest, moments after Tsunoda narrowly prevented the Flip 4 exit wall after spinning, and he managed to catch it in time.
Hulkenberg returned to the highest with a 1m30.721s because the occasions stored falling, however was there for a fraction of a second as Tsunoda grabbed a 1m30.685s to leapfrog the German.
Ocon posted a 1m30.348s regardless of scuffling with the ultimate chicane, however Alonso was on the intermediate tyre and set finest first and second sectors. The braking zone for the hairpin proved rather more tough to take care of, and needed to escape to the run-off.
Max Verstappen then collected a 1m29.190s to go quickest, 0.144s away from Charles Leclerc – who had braved a full lap on the intermediate tyre.
Charles Leclerc, Ferrari SF-23
Picture by: Sam Bloxham / Motorsport Images
A 1m28.968s on intermediates then put Valtteri Bottas on high of the pile, however Alonso lastly obtained the chicane earlier than the start-finish straight proper and bagged a 1m27.517s to throw down the gauntlet.
Carlos Sainz then moved forward of his countryman with a 1m27.245s because the intermediate was now the favoured tyre among the many discipline, however was crushed by over half a second as team-mate Leclerc put a 1m26.733s on the highest shelf.
After an aborted effort after making a mistake in sector two, Hulkenberg took one other run-up and beat Leclerc by 0.3s, and Tsunoda moved into second behind him.
However a 1m25.724s for Leclerc grew to become the brand new headliner, and Sainz slotted into second with a 0.4s deficit to his fellow Ferrari driver.
Regardless of complaints concerning the feeling of his downshifts, Verstappen then threw a 1m24.977s to go the highest of the pile, however Leclerc shaded him by 0.127s to reclaim the bragging rights.
Verstappen discovered nearly 4 tenths on his subsequent timed lap to high the session once more, however his efforts to raised that had been paused as Sainz hit the wall moments after transferring as much as second, spinning at Flip 1 to clout the barrier and knocked off his nosecone.
The purple flag was thus referred to as into service with half-hour left on the clock, prompting a seven-minute hiatus within the session as Sainz’s automobile was fished out of the Flip 1/2 run-off.
Max Verstappen, Pink Bull Racing RB19
Picture by: Andy Hone / Motorsport Images
After the preliminary laps on the restart had been spent bringing the intermediate tyres into their window, Verstappen bettered his time and put collectively a 1m24.192s to increase his benefit.
On his subsequent tour, he raised the bar with a 1m23.779s as a drying line continued to emerge, after which adopted that up on a 1m23.154s as he stored his tyre temperatures up.
The Dutchman’s hole sat at 1.6s over the remainder of the sector, however Leclerc closed that hole to only over 0.2s earlier than Verstappen chipped a smidgen extra day trip of his finest.
However there have been no additional enhancements because the rain started to accentuate 10 minutes earlier than the top, ridding the circuit of its drying line and yielding little else in the best way of data forward of qualifying.
Alonso was third quickest with a 1m24.483s, as a late run for Magnussen put the Dane into fourth place forward of Sainz.
Pierre Gasly spent a lot of the early phases of the session on the backside of the timing boards, however the Frenchman managed to corral collectively time ok for sixth place, a tenth over house favorite Lance Stroll.
Yuki Tsunoda was eighth having stored the automobile out of the wall by means of his spins, whereas Bottas was ninth after his session got here to a barely earlier finish with a free right-hand wing mirror.
Lewis Hamilton accomplished the highest 10, having felt that the staff was “losing time” operating in tough situations because it grew to become obvious that he was struggling to fireplace up the tyres.