The TV camera zooms in on the eyes of Sebastian Vettel as the German waits in the garage to go back out on track.

He had to back his way back into the pits, as he informed his Aston Martin crew: "Something has come loose. Something has definitely come loose in the last corner."

Carlos Sainz almost achieves lift off in the Ferrari as he gobbles up a load of kerb while bouncing along the track. The Spaniard is currently in third place, a tenth behind his team-mate Charles Leclerc.

Andrew Munday: If FIA really want to solve the porpoising, they should allow active suspension to be reintroduced....

Its been a quiet Friday so far over at McLaren HQ, but Lando Norris is running in the top 10 with a 1:14.987, while Daniel Ricciardo, just this second, leaps up the order into eighth, 0.046 seconds away from his team-mate.

Jack Nicholls
BBC Radio 5 Live F1 commentator

"Ferrari are looking a little more back in the mix compared to Verstapen."

Charles Leclerc is chasing Max Verstappen's top time and hits a purple patch in the middle sector. He ends the lap with a time just 0.081seconds off the Red Bull man's marker.

Purple across all sectors for championship leader Max Verstappen and the Dutchman can improve on his quickest time to bank a new marker of 1:14.127 on the soft tyres.

Jack Aitken
Williams reserve driver on BBC Radio 5 Live

"Sometimes the race directors like to take the opportunity to test those systems..."

Valtteri Bottas is having problems with anti-stall on the Alfa Romeo. He's already boxed once because of it and unfortunately, the Finn needs to come back into the pits.

A virtual safety car was briefly deployed, but I don't know what it was for as the adverts were on the telly. Hope it's nothing too serious.

Oh, it was a can. Looks like a beer can.

Sergio Perez, get your coat. Sebastian Vettel has taken your place in fifth with a 1:15.299 on the softs.

Lewis Hamilton also goes quicker than the Red Bull driver, but Vettel's team-mate Lance Stroll decides to give the home fans something to cheer with a 1:15.441 to slip into sixth.

Hamilton is now seventh, Checo slides down to eighth.

1. Max Verstappen (Red Bull)

2. Charles Leclerc (Ferrari)

3. Carlos Sainz (Ferrari)

4. Fernando Alonso (Alpine)

5. Sergio Perez (Red Bull)

Here are some pictures of the pit lane incident at the start of the session between Sebastian Vettel and Kevin Magnussen.

Carlos Sainz, on the other hand, is having a nightmare in the Ferrari.

"Bouncing is really bad, guys," he reports back to the Scuderia pit wall.

The bouncing for Mercedes doesn't look, so far, as aggressive as we've seen in previous races this season. But George Russell still has a message for the Silver Arrows. "Massive hopping through Turn Nine," says the Briton.

Just as I typed that last entry, Sergio Perez went quicker than Alonso to push the Spaniard down a place.

Surely he should be in fourth. Where has he gone? I thought to myself. Turns out, the Alpine driver is now second on the timing sheets with a 1:15.125, half a second away from Verstappen's quickest marker.

Max Verstappen has dropped into the 1:14s as the Dutchman continues to set pace during these Friday practice sessions in Montreal.

Fernando Alonso, on the soft tyres, has snuck into third spot with a 1:15.838.

Charles Leclerc is told he needs "two burnouts" but the Monegasque is chuntering along and can barely do one. "That was because of the turbo," says his engineer.

A few early times on the board and it's Max Verstappen that leads the way on the medium tyres with a 1:15.618.

Sergio Perez, on the same rubber, is just 0.77seconds off the pace of his Dutch team-mate.