The ball went off Henry Slade, and referee Wayne Barnes has decided that is a deliberate knock-on.

But, because there was a covering defender, there is no penalty try.

Chiefs are down to 14 men.

Image source, Rex Features

Brent Pilnick
BBC Sport at Twickenham

What a start! There has never been a quicker try in a Premiership final and it's lit up this place.

All those saying Exeter needed to score first to have a chance have got their wish.

Paul Grayson
Former England fly-half on BBC Radio 5 Live

They have obviously done their homework because that is exactly the same tactic Gloucester employed last week.

Kick the ball at George Kruis and he stone-cold dropped it last week. Perfection.

What response do Saracens have as they get on the ball for the first time in the final?

Playing with an advantage for offside, Sarries pop the ball around before a pass to the left wing goes out for a line-out.

But referee Wayne Barnes is going to the TMO...

Exeter fly-half Joe Simmonds gets us started.

The Chiefs are in all black, and reigning champions Saracens are in all red.

The 2019 Premiership final is under way.

Image source, .

Matt Dawson
Former England scrum-half on BBC Radio 5 live

My money will be on Saracens but I do have a sneaky feeling that Exeter are going to throw something at them.

With 20 minutes remaining I think the game will still be alive

Paul Grayson
Former England fly-half on BBC Radio 5 Live

The game will have pace in it and I think there will be tries.

I think it's going to be played at a furious intensity, too.

The two sides are out onto the Twickenham pitch to a guard of honour of flags, amid pyrotechnics.

A roar from the crowd, and the action is almost upon us.

You could say it is the usual suspects who have reached the final.

Exeter Chiefs and Saracens meet for the third time in four years at Twickenham

The two sides first faced each other in the 2016 final, with Saracens winning 28-20.

The second match-up was 12 months ago with Sarries, once again, running out winners - overcoming the Devonians 27-10.

Will it be third time lucky for the Chiefs?

It's worth remembering the last team to top the league table after 22 rounds and then won the final in the past six years was Saracens in 2016.

Brent Pilnick
BBC Sport at Twickenham

The noise here at Twickenham seems to suggest there are more Chiefs fans than Saracens.

We’ve just had a rousing rendition of the Tomahawk Chop as the Exeter squad departed the pitch for the final time before we get under way.

It was seriously hot out there during the warm-ups... and the pressure is going to be turned up soon as well.

Kick-off is five minutes away.

Image source, Rex Features

Image source, Getty Images

You may think it is unlikely, but both the 2014 and 2017 Premiership finals ended level after 90 minutes.

If today's game is drawn, then there will be a five-minute break before two 10-minute periods of extra time are played.

If the scores are still level after that, then the trophy will go to the team which has scored the most tries over the course of the match.

Should the two sides not be separated by the number of tries, then we'll have a place-kicking competition.

That will involve three kickers from either side, who will attempt to slot the ball through posts from six designated positions on the 10- and 22-metre lines.

If the scores are tied after six kicks for each team, it will go to “sudden death” from the middle of the 10-metre line.

The three kickers must have been on the pitch at the final whistle of extra-time.

I'm sure it'll all be sorted out before we get to a kicking competition, but part of me wants to see one...

Image source, Getty Images

You can send us your thoughts on the final - who will win or who will be the star - by adding #bbcrugby onto your tweets.

We'll include the best ones here in our live text coverage.

Image source, Getty Images

Exeter wing Alex Cuthbert says his decision to forgo his international ambitions has been justified as he prepares to play in the final.

The 29-year-old joined the Chiefs from Cardiff Blues last summer, knowing the transfer would make him ineligible to play for Wales.

And Cuthbert, who scored 16 tries in 47 international outings for Wales, has told BBC Sport Wales that today's match will be the biggest club stage of his career.

Image source, Getty Images

As Saracens chase their fifth Premiership title, you may be wondering how the club became quite so dominant,

The north London side finished third-bottom of the Premiership 13 years ago.

Since then they have moved into a new stadium and brought through a host of home-grown talent.

Mark McCall's side have won their past six major finals, including winning three European crowns.

BBC Sport's Andrew Aloia looks at how one revolution and decade of evolution has bred success for Sarries.

Image source, Getty Images

Wayne Barnes takes charge of his ninth Premiership final today.

The experienced 40-year-old will be refereeing in his 218th domestic league game.

Matthew Carley and Tom Foley are the assistant referees, with Graham Hughes the man monitoring replays as the television match official.

BBC Radio 5 Live

There will be commentary on BBC Radio 5 Live from kick-off - Chris Jones and Sonja McLaughlan will be joined by former England stars Matt Dawson and Paul Grayson.

BBC Radio Devon and BBC Radio London are already on air with build-up, and are also providing comms from Twickenham.

You can select your desired channel at the top of this page.

Image source, Getty Images

Saracens captain Brad Barritt has overcome a hamstring injury to start.

Centre Barritt was a doubt for the European Champions Cup winners after he was forced off in the first half of their semi-final against Gloucester last Saturday.

He takes his place in an unchanged starting line-up as Saracens bid to retain their domestic title.

Seventeen of the 23 featured in last year’s final.

Barritt hasn't been testing himself too strenuously in the warm-up. How long will the hamstring last?

Saracens: Goode; Williams, Lozowski, Barritt (capt), Maitland; Farrell, Spencer; Barrington, George, Koch, Skelton, Kruis, Itoje, Wray, B.Vunipola.

Replacements: Woolstencroft, Adams-Hale, Judge, Isiekwe, Rhodes, Wigglesworth, Tompkins, Strettle.

Image source, Rex Features

Exeter Chiefs are unchanged from their semi-final against Northampton Saints.

Rob Baxter's side will be hoping to rectify a poor Twickenham record that has seen the Devon club victorious just once in seven matches.

They have opted not to select Argentina wing Santiago Cordero - their top try-scorer in the Premiership this season with nine - despite his return to fitness.

Instead Tom O'Flaherty, who scored a brilliant try against Northampton, keeps his place as Exeter make their fourth successive Premiership final appearance.

Exeter: Nowell; Cuthbert, Slade, Devoto, O'Flaherty; J Simmonds, White; Moon, Yeandle (capt), Williams, Dennis, Hill, Ewers, Armand, Kvesic.

Replacements: Cowan-Dickie, Hepburn, Francis, Skinner, S Simmonds, Maunder, Steenson, Hill.