Incredible scenes in Croke Park right now as Mayo players and supporters are singing in the rain. This is a night they are never going to forget but they won't be truly happy unless they can finish the job by winning the final. Who that will be against and when it might take place is anybody's guess. But that's a story for another day. Tonight is all about Mayo. Thanks for following our Match Tracker!

Who could have seen that coming at half time when Dublin led by ten points to four? An extraordinary victory for this young Mayo team, who came from nowhere to win without their talisman Cillian O'Connor. Absolutely remarkable stuff. From half time until the end of extra time, James Horan's heroes outscored the holders by 13 points to four! They will face either Kerry or Tyrone in this year's All-Ireland final! It's Mayo's SIXTH time to qualify for an All-Ireland final in ten years.

All-Ireland SFC semi-final full time: Dublin 0-14 Mayo 0-17 (after extra time)

Mayo have done it! This is their first victory over the Dubs since 2012! Dublin have lost in the championship for the first time since August, 2014. Their 45-game unbeaten championship run is ended. Mayo advance to the 2021 All-Ireland final and Dublin's seven-in-a-row bid is blown out of the water!

Black card!

Lahiff is also sent off. This is all over!

Rock drops the '45' in but James McCarthy dragged a Mayo man to the ground and is black-carded for his troubles.

Block!

Costello goes for an equalising goal but Durcan deflects his shot out for a '45'.

There will be three minutes of injury tie at the end of extra time. Aidan O'Shea is back in.

Yellow card!

Byrne picks up his second yellow of the day for a clumsy tackle on O'Donoghue.

No sign of Dublin getting back into this game. Two minutes to go... The rain in belting down now.

Three minutes left and nothing much happening, much to Mayo's delight!

The visitors are playing keep ball now and looking very, very comfortable indeed. Four minutes remaining.

Yellow card!

Very high and dangerous from Paddy Small on Carr, who stays down and the clock keeps ticking...

Eight minutes left and Basquel re-enters the fray. Dublin back to the full complement but still three points behind...

Wide!

A glimpse of goal for O'Donoghue but he scuffs his shot right and wide under pressure from Fitzsimons.

Mayo have shown tremendous character and quality but it's extraordinary really that Dublin have only managed four points in some 53 minutes of football.

All-Ireland SFC semi-final half time in extra time: Dublin 0-14 Mayo 0-17

The Connacht champions are ten minutes away from a famous victory over the six-in-a-row champions, who are on the verge of a first championship defeat in 46 outings!

Two minutes left in the first period of extra time. Wide by Paddy Small for the 14 men of Dublin.

All-Ireland SFC semi-final: Dublin 0-14 Mayo 0-17 (extra time being played)

Conroy runs at the heart of the Dubs defence and kicks his third great point - Mayo lead for the first time! Darren Coen strokes over another beauty to double the gap! O'Donoghue with another one!

Ooh!

Inches to the right and wide from substitute Tom Lahiff...

Black card!

Colm Basquel heads for the sin bin for ten minutes for what is deemed to have been a deliberate off-the-ball collision.

All-Ireland SFC semi-final: Dublin 0-14 Mayo 0-14 (extra time being played)

A ponderous Dublin attack is broken down by Keegan and Conroy equalises with a stunning strike!

All-Ireland SFC semi-final: Dublin 0-14 Mayo 0-13 (extra time being played)

Dubs sub Sean Bugler powers through to fist a point at the Hill 16 end within 25 seconds of the restart.

With the rain still drizzling down on an unforgettable Saturday night in Dublin 3, the teams return for extra time and the action resumes after a toss of the coin. Mayo win and opt to play into the Davin End.

Mayo won that second half by nine points to three and had all the momentum at the end. If the referee hadn't have blown up, they would almost certainly have foraged a winner. The Dubs actually looked punch drunk. They are second favourites now - Mayo have to believe they are on the verge of a historic win.

All-Ireland SFC semi-final full time: Dublin 0-13 Mayo 0-13

We are going to have extra time! Nothing new between Dublin and Mayo, who hit six of the last seven points to quite remarkably draw level! An additional 20 minutes to come. The teams have both left the pitch. That was a stunning recovery from James Horan's charges and simultaneously a dreadful collapse from Dessie Farrell's men.

O'Connor is down holding his throat off the ball and tempers are frayed here. What is going to happen next?

All-Ireland SFC semi-final: Dublin 0-13 Mayo 0-13

At the second attempt, in the 78th minute, Hennelly re-takes the '45' and splits the posts this time! Level!

Wide!

Hennelly drags his shot right and wide but was being impeded by Dublin substitute Philly McMahon, so it's going to be retaken...

That was madness and Byrne spills the ball out over his end-line for a '45', which Hennelly is going to take...

Dublin are on the ropes big time and they are foolishly playing keep ball deep in their own half...

All-Ireland SFC semi-final: Dublin 0-13 Mayo 0-12

James McCarthy is turned over and McLoughlin is pulled down off the ball by David Byrne. The Dublin full back is shown a yellow card as opposed to a black one and O'Donoghue fires over the free on 74 minutes.

Left and wide from Carr as Mayo battle to halve the deficit. The visitors win the ball back in the 73rd minute and mount another attack...

All-Ireland SFC semi-final: Dublin 0-13 Mayo 0-11

Rock calmly dispatches a superb free between the Hill 16 posts from close to the Hogan Stand!

All-Ireland SFC semi-final: Dublin 0-12 Mayo 0-11

What a time for Conroy to bang over his first of the day! That's Mayo's fourth without reply. Soft free to John Small at the other end and Rock comes over to take it on 70 minutes. We'll have SEVEN added minutes!

Ninety seconds of normal time to go plus at least five or six more to be added on. Still two in it...

Mayo are ravenous and are winning every breaking ball now, but Dublin turn them over. Mayo get it back immediately...

High drama in Croke Park, where we are in the 68th minute. Mayo have hit six points to Dublin's two since the restart!

All-Ireland SFC semi-final: Dublin 0-12 Mayo 0-10

Comerford is penalised for hesitating and overcarrying way out of his goals. The free is moved forward and O'Donoghue taps it over calmly!

All-Ireland SFC semi-final: Dublin 0-12 Mayo 0-9

But O'Connor spectacularly rescues a Hennelly free that looked certain to go wide, volleying the ball back out to Kevin McLoughlin, who takes his score - followed instantly by another one from Flynn! Six minutes left plus a fair bit of stoppage time, I'd imagine.

A Ruane effort drops short and Comerford pulls it down from beneath his crossbar. That injury to McLaughlin has momentarily taken the considerable wind out of Mayo's sails.

All-Ireland SFC semi-final: Dublin 0-12 Mayo 0-7

Dean Rock collects a point effort that's going wide and wriggles around to take a fabulous point. Yellow card for Scully.

Jordan Flynn replaces the stricken McLaughlin, who got an almighty whack there and couldn't see it coming. Small lucky to get away with it.

Injured!

McLaughlin was clattered blindside by a thunderous John Small shoulder there in the run-up to that goal chance. He's going off on a stretcher and looks badly hurt. Mayo are disgusted that no action was taken against the Dublin centre back.

All-Ireland SFC semi-final: Dublin 0-11 Mayo 0-7

Wonderful finish from Small off his left boot. Basquel then blazes a shot across the Mayo goalmouth and inches wide of the right upright!

Two animated camps during the water break. That was a really poor third quarter from Dublin and an equally great one for Mayo, who are bringing in Jordan Flynn.

All-Ireland SFC semi-final: Dublin 0-10 Mayo 0-7

Three between the teams at the second water break! Scully gives the ball away and Mayo counter, pointing through full back Lee Keegan - a classy strike! No score from the holders in the third quarter!

Yellow card!

O'Callaghan is booked for a foul off the ball. Mayo introduce James Carr and Bryan Walsh; Michael Plunkett and captain O'Shea are withdrawn. Dublin are going to bring in Colm Basquel for Costello. Hennelly nails the Mayo free and the Connacht champions are back within four - 0-10 to 0-6!

Turnovers in both halves as attacking defenders Cooper and McLaughlin surrender possession.

Mayo were trying to attack but kept going backwards. Dublin hoover the ball up ... and keep possession for another lengthy spell. Eventually, O'Callaghan fists his effort off the post from a tight angle and then Rock thumps a shot right and wide. Gap is still five with 45 minutes played.

All-Ireland SFC semi-final: Dublin 0-10 Mayo 0-5

Brilliant strike from O'Donoghue! Mayo have started the half explosively. Wide from Rock in response.

Ooh!

With first-half substitute Enda Hession prominent, Mayo almost create a goal chance but Dublin swarm all over them and crowd them out.

Wide!

Ambitious from James McCarthy as he goes for goal but his shot from an awful angle goes way left of the Hill 16 posts.

The teams are back out for the second half. Mayo have no choice now but to throw caution to the wind.

Rumours of Dublin's demise appear to have been greatly exaggerated. The six-in-a-row winners controlled most of that opening period and it's going to be a long road back for Mayo from here. None of their forwards have scored from play so far.

All-Ireland SFC semi-final half time: Dublin 0-10 Mayo 0-4

Conor Loftus hammers over an inspirational point and Scully is crowded out at the other end before the short whistle sounds with six between the teams.

Conroy registers Mayo's fourth wide in the first of three added minutes at the end of this first half. Brian Fenton executes a beautiful catch from Evan Comerford's kick-out. The Leinster champions hold possession again, taunting Mayo. Eventually, the visitors win it back and break...

All-Ireland SFC semi-final: Dublin 0-10 Mayo 0-3

Dublin keep the ball for an eternity, with Mayo chasing shadows. I'd say their entire team were involved in that passage of play, which is punctuated by a Kilkenny point from a forward mark.

Yellow cards for Cormac Costello and Paddy Durcan for jostling off the ball. Three minutes left in the first half.

Defending!

Mayo go Route One to O'Shea and O'Callaghan of all people gets a touch to divert the danger. At the Davin End, John Small picks out brother Paddy, who splits the posts. Hennelly then comes out of goal to spear over a Mayo free from 48 metres off the deck.

All-Ireland SFC semi-final: Dublin 0-8 Mayo 0-2

O'Callaghan misses from an advanced mark. Jonny Cooper collects Rob Hennelly's stray restart and Rock strokes over another free from the hands after Small is fouled once more.

Brian Howard is down receiving treatment after receiving a blow to the side of the head.

All-Ireland SFC semi-final: Dublin 0-7 Mayo 0-2

At the other end, Paddy Small is taken down by Conroy and Rock makes no mistake from the resulting free.

Hot potato

Dublin pick Mayo's pockets and move forward but their build-up is laboured and Mayo overturn them. Dublin get it back, then Mayo steal it again. After collecting an advanced mark under an excellent O'Connor delivery, O'Shea rattles the outside of the left upright with a close-range left-footed shot that was possibly easier to score than miss...

All-Ireland SFC semi-final: Dublin 0-6 Mayo 0-2

There are a lot of scrappy breaking balls and Dublin are winning the majority of them. Paddy Small is awarded a soft free under pressure from Eoghan McLaughlin and Rock pops it over, with jeers ringing out again. Four between the sides at the first water break.

All-Ireland SFC semi-final: Dublin 0-5 Mayo 0-2

Kilkenny with the finish again. The entire Dublin full-back line was involved in that attack as the champions held possession for almost two minutes before crafting a point. O'Donoghue ignores the unsavoury jeers to thump over a great free from the hands.

All-Ireland SFC semi-final: Dublin 0-4 Mayo 0-1

Brilliant strike from Matthew Ruane, high and handsome from the edge of the D to open Mayo's account in the twelfth minute!

All-Ireland SFC semi-final: Dublin 0-4 Mayo 0-0

Patient and ruthless from Dublin. The move begins with O'Callaghan going back 30 yards and culminates with him fisting a point 30 seconds or so later! Wide under Hill 16 from Aidan O'Shea.

All-Ireland SFC semi-final: Dublin 0-3 Mayo 0-0

It has been a tenacious start from Dublin, who are really getting stuck in. Rock whips over their third point - left-footed from a difficult angle. Class.

All-Ireland SFC semi-final: Dublin 0-2 Mayo 0-0

Con O'Callaghan to Kilkenny and the latter takes a delightful trademark point off his left boot.

Yellow card!

Dean Rock booked for a foul on Tommy Conroy on three minutes. Diarmuid O'Connor miscues the free but Mayo win another one. From out wide on the left, Ryan O'Donoghue misses the target too.

Well wide off the boot of Niall Scully after a protracted period of Dublin possession. Mayo have been pressed back inside their own half since throw-in...

All-Ireland SFC semi-final: Dublin 0-1 Mayo 0-0

Ciaran Kilkenny is manhandled and Dean Rock taps over the free from his hands after just 40 seconds.

Game on!

Referee Conor Lane gets us started. Mayo won the toss and are attacking Hill 16 in the first half.

National Anthem time. The stage is set for a very special occasion...

Team news:

Eoin Murchan replaces Sean McMahon in the Dublin starting team. Mayo are going to start as selected.

Both teams are out on the pitch and we are 20 minutes from throw-in. This has the makings of a really great match.

First blood to the Dubs...

The curtain-raiser a Croke Park today also pitted Dublin against Mayo. It was the ladies All-Ireland semi-final and the Dubs prevailed by 1-17 to 2-9.

Mayo are aiming to qualify for a sixth final in ten years - which is some record in itself! They go into today's game as back-to-back Connacht champions.

Dublin are bidding to reach their ninth All-Ireland final in eleven years. They are unbeaten in 45 championship matches and have been Leinster champions for eleven years running.

The prize for the winners?

There is a lot of uncertainty as to the fate of the other semi-final as Tyrone have opted to withdraw from the All-Ireland due to the Covid situation in their camp. They feel that they have not been given enough time to regroup and recover and prepare for such a huge match. They released a statement this afternoon confirming that they are unable to field a team for the rearranged fixture this day week. That game was originally scheduled for tomorrow but was pushed back six days. Alas, this is nowhere enough time for the Ulster champions. Hopefully all of their players and various squad members - and all of their friends and family - are okay health-wise. That's the main thing. Thus, as things stand, it looks like Kerry will get a Bye into the final.

Mayo (All-Ireland SFC v Dublin): Rob Hennelly; Padraig O’Hora, Lee Keegan, Michael Plunkett; Paddy Durcan, Stephen Coen, Eoghan McLaughlin; Matthew Ruane, Conor Loftus; Diarmuid O’Connor, Kevin McLoughlin, Darren McHale; Tommy Conroy, Aidan O’Shea, Ryan O’Donoghue.

Subs: Rory Byrne, Colm Boyle, Brendan Harrison, Enda Hession, Jack Coyne, Conor O'Shea, James Durcan, Bryan Walsh, Jordan Flynn, Darren Coen, James Carr.

Dublin (All-Ireland SFC V Mayo): Evan Comerford; Michael Fitzsimons, David Byrne, Jonny Cooper; James McCarthy, John Small, Sean McMahon; Brian Fenton, Brian Howard; Paddy Small, Ciaran Kilkenny, Niall Scully; Dean Rock, Con O’Callaghan, Cormac Costello.

Subs: Michael Shiel, Colm Basquel, Ryan Basquel, Sean Bugler, Aaron Byrne, Tom Lahiff, Robert McDaid, Philly McMahon, Eoin Murchan, Peadar Ó Cofaigh Byrne, Cillian O'Shea

Is today going to be the day that the men from the west finally put their east-coast rivals to the sword? Whatever happens, it's sure to be fascinating fare as this wonderful rivalry is renewed on the big stage.

Irrepressible Mayo

Mayo haven't managed to defeat Dublin in the championship since the 2012 All-Ireland semi-final, but boy have they come close! A huge rivalry had developed between the two counties, with eight unforgettable meetings in the latter stages of the All-Ireland during that period - eight finals, two semi-finals, a replayed final and a replayed semi-final.

Dominant Dubs

The Dubs go into the game defending an astonishing seven-year unbeaten championship record going all the way back to August, 2014, when Donegal shocked them at this stage.

All-Ireland SFC semi-final:

In a repeat of last year's All-Ireland final, these great rivals will collide once more at GAA HQ this evening for a place in the 2021 Sam Maguire Cup decider.

When Dublin and Mayo come face to face at Croke Park it's always a special occasion.