Aston Martin driver Fernando Alonso was fastest in Friday practice at the Canadian Grand Prix on a day disrupted by intermittent rain.

Alonso’s best time, which put him 0.463 seconds ahead of Mercedes’ George Russell in second, came at the driest point of the second session before more rain fell in Montreal.

The first session, in which McLaren’s Lando Norris was fastest, was also rain-affected, so the headline lap times of the day were almost entirely meaningless.

But there were obvious problems for championship leader Max Verstappen.

The Red Bull driver, who was 18th fastest in the second session, pitted after just four laps with smoke pouring from the back of his car.

Red Bull said his car had suffered a problem with the energy recovery system.

Wet weather was the theme of the day. At one stage, before practice started, organisers closed the Ile-Notre Dame, the man-made island in the St Lawrence Seaway that hosts the track, because of a heavy storm.

The first session started on time but the cars were unable to go out on track as the pit lane was not opened while marshals tried to dry the track.

When it did get under way, it progressively dried to the point that the drivers were able to run slick tyres for the final five minutes of the session.

Norris set the pace by 0.328secs from the Ferraris of Carlos Sainz and Charles Leclerc.

In the second session, Alonso ran consistently at the front as the track had a brief dry period for 15 minutes or so at the start before rain started again.

Behind Alonso and Russell, the Spaniard’s team-mate Lance Stroll was third fastest, from Leclerc, RB’s Daniel Ricciardo, Haas driver Kevin Magnussen and Lewis Hamilton’s Mercedes.

Despite the conditions, only one driver crashed all day – Sauber’s Zhou Gunayu lost control through Turn Five in the first session and broke his front suspension.

Leclerc won a cheer from the crowd at the hairpin when he did a 360-degree spin in the second session, to no harm.