Andrew Benson
BBC Sport’s chief F1 writer in Monaco

Red Bull have had to change Verstappen's gearbox. So a five-place grid penalty even if he sticks it on pole.

Here we go. Eighteen minutes of Q1. The bottom five fail to move on to Q2.

We are still not sure if Max Verstappen will be able to be in qualifying.

If he doesn't that will mean he will start 20th tomorrow, or 19th if Romain Grosjean comes in the bottom three in qualifying as he has a three-place grid penalty after causing a three-car pile up on the first lap in Spain.

Track temperature? An absolutely sweltering 49C.

Harvey Falshaw: A real shake up: Ferrari have Vettel and Hamilton with Mercedes getting Alonso and Riccardo, how tasty would that be? Plausible, but unlikely lets face it... Would be amazing for F1 tho! Bottas to McLaren/ Renault, Sainz to Red Bull, Grosjean to Williams? Unlikely scenario.

Luke Jones: Would like to see Verstappen at Ferrari with Seb and Nico Hulkenburg partner Lewis at the Silver Arrows. Ricciardo and Gasly at Red Bull.

David: Why would Ferrari countenance anyone but a Vettel wingman next season. And Bottas doing a good job. No change for 2019

The Red Bull mechanics are still working on Max Verstappen's car. The clock is ticking. We start Q1 at 14:00 BST and that only lasts for 18 minutes.

Quick, quick.

BBC Radio 5 live

Our coverage on BBC Radio 5 live will be getting under way shortly. Press the play button at the top of this page to listen along to Jack Nicholls, Jennie Gow and Jolyon Palmer.

Image source, .

Kimi Raikkonen got himself on to pole position at this race last year, but finished second on the Sunday behind team-mate Sebastian Vettel.

However, the Finn has not had another pole position since.

Daniel Ricciardo has also not been on pole since qualifying in style in Monaco in 2016, although again pole did not lead to a race victory. He looked to have it in the bag until a bungled pit stop as Red Bull had the wrong tyres ready when he entered the pits to help Lewis Hamilton win.

Image source, .

JJ Jackson: Is it too negative to suggest who shouldn't be driving in '19? Lance Stroll. Know he brings lots of money, but Williams need an experienced driver on the track to lead the team.

Aiden Macfarlane‏: Vettel and Alonso at Ferrari just for the fun factor. Lewis and Riccardo at Mercedes to see Lewis pushed and whether Ric can really do it as I think he could beat him.

The so-called Red Bull Energy Station seems a fantastic place to watch all the action from and chill out on a sunny Saturday.

Image source, .

Sebastian Vettel won this race last year after qualifying in second and on most of the times in the history of this race you need to get yourself into the top three in qualifying to have any chance.

Image source, .

Shaun Bennett‏: Vettel + Ricciardo at Ferrari. Lewis + Bottas at Mercedes. Need a definite No. 2 for Lewis to be most successful. Ricciardo to get nursed so can become No. 1 when Vet leaves.

Peter Coleman: Apparently Leclerc is earmarked for Ferrari; otherwise he looks like a good replacement for Hartley, who seems like he's been promoted above his level.

Image source, Huw Evans picture agency

Amid the glitz and glamour of Monte Carlo, can Lewis Hamilton extend his winning streak? Predict your podium top three in Monaco.

Our friends at BBC World have put together a piece with Zimbabwean Axcil Jefferies, who hopes to be the first African racing driver to make it on to the Formula 1 starting grid for more than two decades.

Jefferies, 24, has previously competed in Formula Two, coming 12th overall in 2012.

Watch the video below.

Deji Guerrero‏: Why are Ferrari playing these childish games of pretending to be uncompetitive during FP1 and FP2 and then turning up the pace for qualifying? It's old now.

Inge‏: Max V is not particularly bright, is he? He seems to learn nothing from his own mistakes.

D Rag‏: Merc need to sort out the front end that's why they struggle with low grip tyres and following other cars and low downforce.

Remember, we are also asking - who should be racing for each team in 2019 and why?

Tweet us using #bbcf1 to have your say.

Red Bull, one and two in all three practice sessions, were confident of closing the gap on second-placed Ferrari. Maybe now, not so much.

Image source, .

This is how things look in the drivers' championship with Lewis Hamilton 17 points in front of Sebastian Vettel, although the Ferrari man will be confident of closing that gap.

Daniel Ricciardo, fastest in all three practice sessions, will be hoping to jump up to third in the table by late Sunday afternoon.

Image source, .

This is the bottom 10...

Image source, .

The Red Bull mechanics have been working frantically since that Max Verstappen accident in FP3. It seems that the gear box has not been changed, so no grid penalty at the moment.

Another hour for them to work on the car to see if he can take part in qualifying.

Andrew Benson
BBC Sport’s chief F1 writer in Monaco

Verstappen hit the inside barrier on the right-hand initial bit of the chicane, breaks front suspension, into the wall. It is exactly the same accident he had in 2016. I would imagine the car will be repaired in time but has that already handed pole to Ricciardo?

That's six races in a row that Verstappen has had a crash or other similar incident. He keeps saying he doesn't need to change anything. Reality would suggest otherwise.

This is what Max Verstappen posted on Twitter before third practice.

Image source, .

He certainly did go for it. He was quickest in the field until....

Image source, F1

Image source, Formula 1

Image source, Formula 1