Kimi Antonelli put Mercedes on top in Canadian Grand Prix practice, beating George Russell in a messy but important Montreal session.

The world championship leader set a 1:13.402 in the only practice hour of the Sprint weekend. Russell finished 0.142s behind, giving Mercedes a clear one-two after bringing its first major upgrade package of the season.

That mattered more than a normal Friday result. Sprint weekends give teams only one practice session before competitive running starts. A strong first hour can shape the whole weekend, while a bad one leaves little time to recover.

Mercedes arrived in Canada with momentum already on its side. The team has won the opening four races of the season, and Antonelli has taken the last three. The 19-year-old now leads Russell by 20 points in the standings.

Montreal gave Russell a chance to push back. He won at this circuit last year and entered 2026 as the pre-season favourite inside Mercedes. Instead, Antonelli landed the cleaner headline and added pressure before the timed sessions.

Russell’s afternoon became more complicated late in the session. He spun off track, tapped the barrier and then brought the car back to the pit lane. The contact did not cause significant damage, but the timing was awkward.

In a title fight between teammates, small images carry weight. Antonelli looked composed at the top of the timesheet. Russell looked quick, but also slightly on the edge when the session tightened.

The practice result does not settle the weekend. Teams run different fuel loads and power settings, and they do not reveal those details. Still, a Mercedes one-two on upgrade day sends a strong message to Ferrari, Red Bull and McLaren.

The session also kept race control busy. Three red flags broke up the rhythm and made long-run preparation harder.

A red flag stops the session completely. Cars return to the pit lane while officials clear a stopped car, debris or another hazard. In a Sprint weekend, every stoppage removes useful setup time.

The first stoppage came when Liam Lawson stopped with a technical issue for Racing Bulls. Alex Albon then crashed his Williams after hitting a groundhog, an unusual and unfortunate moment on a circuit lined by parkland. Esteban Ocon caused the third red flag when he lost control of his Haas and hit the barriers at high speed.

Officials added 19 extra minutes after the first two stoppages, giving teams back some of the time lost to track clearing. Even so, the disrupted pattern made it harder to read race pace.

Ferrari emerged as the nearest challenger on the timesheet. Lewis Hamilton took third, 0.774s slower than Antonelli, and finished nearly two tenths ahead of Charles Leclerc in fourth.

That placed Ferrari close enough to stay in the conversation, but not close enough to ignore the size of Mercedes’ advantage. A gap of almost eight tenths in one practice session can shrink quickly. It can also point to a car that is immediately comfortable.

Max Verstappen finished fifth for Red Bull, 0.964s off the top. That left the reigning powerhouse within range of Ferrari, but still almost a full second away from Antonelli’s benchmark.

McLaren had the most difficult session to judge. Reigning world champion Lando Norris was sixth, 1.397s behind Antonelli. Oscar Piastri followed in seventh, 1.561s off the lead pace.

McLaren added further upgrades to the package it introduced in Miami, but both drivers made errors on their flying laps. A flying lap is the fully committed lap a driver uses to test qualifying speed. When that lap goes wrong, the timesheet can make the car look worse than it really is.

That makes Sprint Qualifying especially important for McLaren. If the car has hidden pace, it needs to appear quickly. If not, Mercedes may have stretched the gap at exactly the wrong point for the chasing pack.

Behind the top seven, Arvid Lindblad took eighth for Racing Bulls, ahead of Nico Hulkenberg in ninth for Audi and Fernando Alonso in tenth for Aston Martin. Gabriel Bortoleto placed 11th for Audi, with Isack Hadjar 12th for Red Bull.

Ocon still ended 13th despite his crash, while Albon finished 14th after his own incident. Carlos Sainz followed in 15th for Williams, ahead of Pierre Gasly, Lance Stroll, Lawson and Oliver Bearman.

The two Cadillac cars sat near the bottom of the classified order, with Valtteri Bottas 20th and Sergio Perez 21st. Franco Colapinto had the most costly session of all, as a power unit issue restricted his Alpine to one lap and left him without a time.

That is a tough position before Sprint Qualifying. A power unit problem limits mileage, and mileage is the driver’s best tool for learning braking points, bumps, kerbs and tyre behaviour.

Montreal often rewards confidence. The walls sit close, the braking zones are heavy and the final chicane can punish even a small mistake. Drivers need rhythm there, but this practice session kept interrupting it.

For Mercedes, the key question now is whether the upgrade gives the car repeatable pace across the weekend. A single lap in practice is one thing. Sprint Qualifying, the Sprint, Grand Prix qualifying and the race all ask different questions from the tyres and the balance.

The published weekend schedule put Sprint Qualifying at 9.30pm UK time on Friday, the Sprint at 5pm UK time on Saturday, Grand Prix qualifying at 9pm UK time on Saturday and the race at 9pm UK time on Sunday.

For Indian viewers, those headline sessions convert to 2am Saturday for Sprint Qualifying, 9.30pm Saturday for the Sprint, 1.30am Sunday for qualifying and 1.30am Monday for the Grand Prix.

The support programme also matters for feeder-series followers. The Canadian weekend includes F2 qualifying, the F2 Sprint and Feature Race, plus three F1 Academy races across Saturday and Sunday.

But the central F1 story remains Mercedes. Antonelli has been winning races. In Montreal, he also owned the first serious question of the weekend: whether Mercedes’ new package had landed cleanly.

The answer after practice was yes, with caution attached. Red flags distorted the hour, McLaren had scruffy laps and nobody knows every team’s fuel load.

Still, Mercedes did what a championship-leading team should do on a compressed race weekend. It put both cars clear, gave Antonelli another sharp statement and left Russell needing a response before points start to fall.