That's all from me for today. Well done to Donegal and Mayo, hard luck to Derry and Leitrim. Thanks for reading!

Derry led for virtually the entire match but were overhauled during those dramatic closing moments. That was the game of the year so far by a mile - hopefully there is plenty more where that came from in the coming weeks!

Ulster SFC full time: Donegal 0-16 Derry 0-15

With Derry laying siege to the Donegal goal, the final whistle sounds! The hosts left it late but dig out the win thanks to a stunning Patrick McBrearty score from the wing. He had been brilliantly marshalled all day by Chrissy McKaigue but that's what happens when you give him an inch! You have to feel for Derry, whose year is over following the narrowest of defeats - their first of 2021. Donegal will meet Tyrone at the semi-final stage next weekend!

Winner!

Wow! McBrearty hammers over what is surely the winning point on 74 minutes!

Ulster SFC: Donegal 0-15 Derry 0-15

McGuigan curls over a massive pressure free from the hands and clenches both fists in celebration!

McKinless goes down under pressure from Murphy and Derry have a free-in from the right wing...

Derry trying to force an opening...

Ulster SFC: Donegal 0-15 Derry 0-14

Donegal lead for the first time. MacNiallais is pulled by Brendan Rogers and Coldrick blows for a free, which McBrearty fires over in the first of four additional minutes.

Wide from McFaul with 15 Donegal men behind the ball. One minute left now...

The visitors play the ball all the way back to their goalkeeper and then come again...

Three minutes left. Donegal drop off and Derry move tentatively forward...

Ulster SFC: Donegal 0-14 Derry 0-14

Ryan McHugh is fouled and Murphy calmly slots a tricky enough free from the hands to tie the scores up on 65 minutes!

Ulster SFC: Donegal 0-13 Derry 0-14

Not for the first time, McFaul shows the confidence and character to fire over a magnificent score and Derry are back in front!

Seven minutes left. Who is going to win this? Are we going to have extra time?

Level!

Sumptuous strike from the superb O'Donnell off the outside of his right boot and they are level! Bizarre wide from McGuigan at the other end with the net beckoning!

Ulster SFC: Donegal 0-12 Derry 0-13

Token resistance this time from Derry, whose defending for once is not tight enough and O'Donnell whacks over a wonderful point.

Ulster SFC: Donegal 0-11 Derry 0-13

Gareth McKinless has been outstanding and the centre back has just lofted over an inspirational point for his county!

Ulster SFC: Donegal 0-11 Derry 0-12

This is starting to look a little ominous. Derry have lost their momentum and Langan slots a point to make it a one-point game after 54 minutes.

A massive 18 minutes coming up here in Ballybofey...

Ulster SFC: Donegal 0-10 Derry 0-12

Murphy attracts the attention of three men and handpasses to fellow substitute Paul Brennan, who points to leave two between them at the second water break!

Keeper!

Crucial save by Derry goalkeeper Odhran Lynch under the dropping ball with Murphy breathing down his neck!

Ulster SFC: Donegal 0-9 Derry 0-12

Donegal really are turning to the cavalry now - Odhran MacNiallais is also sprung from the the bench. Murphy wins and converts a free (which he takes from the hands).

Ulster SFC: Donegal 0-8 Derry 0-12

The Oak Leafers smell blood in Ballybofey! Emmet Bradley takes his point to leave four between the teams!

Ulster SFC: Donegal 0-8 Derry 0-11

McFaul hits an exquisite score and Donegal react by introducing Michael Murphy for the last 24 minutes! Huge moments here now!

Ulster SFC: Donegal 0-8 Derry 0-10

Cutting in from the right, Heron opts to take his point after considering a handpass across the goalmouth...

Donegal almost force a goal chance but Eoghan Ban Gallagher is crowded out.

Ulster SFC: Donegal 0-8 Derry 0-9

Loughlin cancels out McGonigle's point with a terrific strike and the visitors reclaim the lead!

Ooh!

Cassidy handpasses across the face of goal and Heron palms his goal effort onto the crossbar and onto the goal-line. So close to a Derry goal. It's a four-point swing as Donegal then equalise through McGonigle!

Ulster SFC: Donegal 0-7 Derry 0-8

Caolan McGonigle drops over the levelling score two minutes after the restart. Derry reply with a sweet strike from wing back Conor Doherty!

Yellow card!

Before the start of the second half, Stephen McMenamin is booked for a high tackle perpetrated on McGuigan at the end of the first half!

It's been a tense and nervy match so far, with Derry largely playing the game on their terms. Donegal quite fortunate to be just one behind. This is a big test for Declan Bonner's men, who may need to introduce Michael Murphy.

Ulster SFC half time: Donegal 0-6 Derry 0-7

Derry deservedly lead by the odd point from 13 at the end of a keenly-contested opening half that was all about transitioning from attack to defence and vice-versa.

There will be one minute of additional time at the end of the first half. Niall O'Donnell is down winded after a heavy landing.

The scores have dried up with packed defences making shooting very difficult. Derry raid forward and Ethan Doherty is pulled down - Niall Loughlin takes the free from the deck from the left wing and drags it left and wide.

Both teams like to attack as a unit and defend as a unit so there is a lot of running back and forth each time possession changes hands. Literally, as there is barely a forward kick-pass to be seen here. Possession is nine-tenths of the law.

A Derry turnover and Donegal retreat en masse. They win the ball. The law of big numbers! Now Derry retreat...

Ulster SFC: Donegal 0-6 Derry 0-7

With ten minutes left before the break, McBrearty picks out Michael Langan and he closes the gap to two. Ninety seconds later, after a patient build-up, Langan hammers over another one!

Ulster SFC: Donegal 0-4 Derry 0-7

Glass prominent again as the visitors recycle the ball to McGuigan and he takes a lovely point. Brennan replies as the tempo rises.

Ulster SFC: Donegal 0-3 Derry 0-6

Niall O'Donnell replies following a superb Patton restart! Donegal retreat back into their own half...

Ulster SFC: Donegal 0-2 Derry 0-6

Dreadful defending from the home side gifts Derry a needless free and McGuigan, the man who was pushed over, gets back on his feet to curl over with his left foot from the hands.

Ulster SFC: Donegal 0-2 Derry 0-5

That's a sensational point from Conor Glass! Pure class from the former AFL man! Derry have been impressive thus far.

Derry break down a Donegal attack and every Donegal player turns and sprints back into his own half!

Ulster SFC: Donegal 0-2 Derry 0-4

Rory Gallagher's men easily cut through their opponents and wing back Padraig Cassidy fists his point after getting played in behind. Two between them at the first water break.

Ulster SFC: Donegal 0-2 Derry 0-3

Derry are unlucky to concede the free and McBrearty teases it over from a tight angle.

Ulster SFC: Donegal 0-1 Derry 0-3

In the twelfth minute, Brennan settles Donegal's nerves with an excellent finish from distance off the right boot. The hosts really needed that! At the other end, Conor Glass picks out Ciaran McFaul and he arrows over a superb point from the right wing!

Donegal have been decidedly underwhelming in the first ten minutes...

Ulster SFC: Donegal 0-0 Derry 0-2

Benny Heron shrugs off his man and opens the scoring on seven minutes. Shaun Patton makes a mess of the kickout and McGuigan adds another.

No penalty!

McGuigan goes down looking for a penalty but referee David Coldrick waves play on!

Ooh!

A scramble in the Derry goalmouth comes to nothing and the Oak Leaf men are relieved to clear their lines.

Post!

McGuigan hits the woodwork again, this time from a free. The ball rebounds to a Derryman and a goal chance presents itself but Hugh McFadden executes a wonderful goal-saving block!

Patrick McBrearty's free is moved in but he surprisingly drags it right and wide.

Post!

Shane McGuigan cuts in from an acute angle and tries to fist a point but the angle was against him and it's wide off the left upright.

Game on!

Is this the game that will ignite the 2021 football championship?

This is Division One against Division Three but Derry are unbeaten this year and may just put it up to their neighbours...

Team news:

Derry are starting as selected against Donegal. Hopefully we'll have a closer contest at Ballybofey, where throw-in is just 20 minutes away. Interesting that Donegal aren't starting their inspirational captain, who has started more than 50 consecutive championship matches...

Connacht SFC full time: Mayo 5-20 Leitrim 0-11

Conor Dolan closes the scoring with a lovely point. But Mayo prevail with 24 points to spare and advance to a Connacht final meeting with Galway in a fortnight.

Connacht SFC: Mayo 5-20 Leitrim 0-10

Substitute James Carr gathers a powder-puff O'Donoghue free and lashes it over the bar from close range.

Connacht SFC: Mayo 5-19 Leitrim 0-10

O'Donoghue (free), Aidan O'Shea and McHale pile further misery on Leitrim. We are in the first of four added minutes.

Team news:

No Michael Murphy in the Donegal starting XV today; he is replaced by Jamie Brennan. Eoin McHugh and Ethan O'Donnell also get late call-ups in place of Brendan McCole and Peadar Mogan.

Connacht SFC: Mayo 5-16 Leitrim 0-10

O'Rourke fires his second. James Horan will not be impressed with how Mayo have performed in the last five minutes.

Eight minutes left. Blow it up ref.

One of the really sobering things about this scoreline is that Mayo are actually depleted today... Not that the players on duty have not all stood up to be counted.

Connacht SFC: Mayo 5-16 Leitrim 0-9

Substitute Evan Sweeney steers over a delightful Leitrim point; Darren Coen replies off the outside of the foot.

Connacht SFC: Mayo 5-15 Leitrim 0-8

Darren Coen helps himself to a lovely point after gathering a high pass that went from one wing to the other.

At the second water break, the holders hold a 21-point advantage, 5-14 to 0-8.

Connacht SFC: Mayo 5-14 Leitrim 0-8

A big roar as Mayo throw Colm Boyle in for the last quarter, replacing Paddy Durcan. Beirne nails a free for his fifth of the match and Leitrim's four in succession.

Connacht SFC: Mayo 5-14 Leitrim 0-7

Substitute Riordan O'Rourke takes his point after Leitrim almost work a goal chance. That's their third unanswered point.

Connacht SFC: Mayo 5-14 Leitrim 0-6

Considering that the sun is just one of billions of stars in the multiverse, and the majority of them could have planetary systems orbiting around them, the odds of some of those being in the goldilocks zone and of life forming there would appear to be quite good. Having said that, it does of course require a series of random fluke events for life to form so who knows? O'Donoghue fists a point and Beirne replies from a free before captain Paddy Maguire adds to the visitors' tally

Goal!

Darren Coen to Conroy and he blasts the ball to the roof of the net after rounding the goalkeeper - 5-13 to 0-4! I wonder is there intelligent life on other planets or are we alone in the great cosmos.

Connacht SFC: Mayo 4-13 Leitrim 0-4

O'Donoghue taps over a free. I'd probably have tucked that one away myself. By probably, I mean possibly...

Goal!

O'Donoghue decides to stick the ball in the net - 4-12 to 0-4.

Connacht SFC: Mayo 3-12 Leitrim 0-4

Flynn makes a great save to deny Ruane from point-blank range and Loftus takes his point from the rebound.

It's going to be difficult to find an equitable solution that's fair to everybody but anything has to be better than this, in fairness. It's a shambles.

We have witnessed a succession of one-sided games in the football championship so far in 2021 and I'm 100% confident that a change is going to be made imminently. This simply cannot continue any longer. Only one of the four provinces is in any way competitive.

Connacht SFC half time: Mayo 3-11 Leitrim 0-4

Beirne takes this free from the hands with his left and the result is the same - a nice point. The short whistle sounds with 16 points between the teams and the game has been so one-sided that - through no fault of the players, of course - it is tough to watch, to be honest.

Prior to that, Beirne popped over a Leitrim free to close the gap to 17...

Wide!

Michael Plunkett toe-pokes the ball inches wide of the left post when a fourth Mayo goal looked ominous. He is down injured now after colliding with the Leitrim goalkeeper.

Eighteen points between the teams after half and hour and it's hard not to see this game as a watershed moment for the championship. Calls for restructuring will be deafening after the final whistle. Looking at Twitter, they already are!

Goal!

McHale plants a left-footed shot in the top left corner with hapless Leitrim defenders falling over like skittles - 3-11 to 0-2. The referee should probably stop this.

Goal!

In fairness, this is a turkey shoot and it's hard to make any case for the GAA continuing with a championship structure that facilitates massacres such as this. Full forward Darren McHale pushed the second Mayo goal to the net with his left hand - 2-11 to 0-2!

Connacht SFC: Mayo 1-11 Leitrim 0-2

Conor Dolan with the best point of the day so far. He runs at the Mayo defence at pace and taps over to reduce the arrears to eleven. Unchallenged and unrushed, Darren Coen replies from distance.

Goal!

A luckless slip and handling error in the all-at-sea Leitrim defence presents Darren Coen with possession straight in front of goal. He walks around the goalkeeper and rolls the ball to an empty net - 1-10 to 0-1!

Connacht SFC: Mayo 0-10 Leitrim 0-1

Panic in the Mayo defence following a harmless looking centre but goakeeper Rory Byrne and Padraig O'Hora combine to clear their lines. At the other end, Loftus nails a stunning point and O'Donoghue makes no mistake from a free.

Connacht SFC: Mayo 0-8 Leitrim 0-1

Ruane moves inside and takes his second score nonchalantly off his left foot. Far too easy. The referee takes pity on Leitrim and awards them a soft free close to goal, which Beirne taps over in the 18th minute. Seven in it at the first water break. The players hardly need any water as it is spilling down.

Connacht SFC: Mayo 0-7 Leitrim 0-0

Without meaning to borrow clichés, this has developed into a pointless exercise already. O'Donoghue makes it seven without reply for the hosts, who are cantering along in second gear.

Connacht SFC: Mayo 0-6 Leitrim 0-0

Aidan O'Shea picks out O'Donogue with a terrific pass and the No.15 finally gets his opening point; opposite corner man Conroy following up instantly with his third.

Connacht SFC: Mayo 0-4 Leitrim 0-0

With his right boot this time, Conroy fires over a brilliant point. Midfielder Stephen Coen comes through the centre unopposed and makes it four-zip.

Connacht SFC: Mayo 0-2 Leitrim 0-0

Mayo dispossess the visitors and carve open their defence, Matthew Ruane fisting their second point. Flynn then makes a brilliant point-blank save with his foot to deny O'Donoghue what looked like a certain Mayo goal.

Connacht SFC: Mayo 0-1 Leitrim 0-0

In the fifth minute, Tommy Conroy fires a left-footed effort over the bar via the inside of the far upright. Leitrim goalkeeper Brendan Flynn handpasses the ball aimlessly out for a Mayo '45' and Conor Loftus thumps it off the post again.

Poor start from both teams here - wide from Ryan O'Donoghue.

Keith Beirne sends a Leitrim shot left and wide. From straight in front of the posts, he should have put that one over.

Post!

Darren Coen's early strike rebounds off the left upright. Mayo are clad in their alternative black jerseys.

Game on!

Referee Fergal Kelly throws in the ball. Slippery conditions here as there was some rain prior to the start.

Team news:

Mark Diffley replaces Oisin Madden in the Leitrim defence.

Team news:

Mayo are depleted due to a combination of injury and reports of a Covid outbreak in their camp. Two late changes to their starting XV see Jordan Flynn and Darren Coen replace Eoghan McLaughlin and Bryan Walsh.

Shock on the cards?

Considering that Leitrim lost all three of their outings in Division Four North earlier this year, it's very difficult to make any case for them troubling Mayo today. Anything other than a comprehensive victory for the holders would represent a major surprise.

Leitrim (Connacht SFC v Mayo): Brendan Flynn; Conor Reynolds, Donal Wrynn, Oisin Madden; Cillian McGloin, Paddy Maguire, David Bruen; Jack Gilheany, Mark Plunkett; Conor Dolan, Shane Moran, Tom Prior; Darragh Rooney, Keith Beirne, Shane Quinn.

Mayo (Connacht SFC v Leitrim): Rory Byrne; Enda Hession, Padraig O'Hora, Michael Plunkett; Paddy Durcan, Oisin Mullin, Eoghan McLoughlin; Matthew Ruane, Stephen Coen; Conor Loftus, Aidan O'Shea, Byran Walsh; Tommy Conroy, Darren McHale, Ryan O'Donoghue.

Two massive matches for sure and we'll provide live updates on all the drama as it unfolds.

Ulster SFC:

Ballybofey will provide the setting for the last of this summer's Ulster football quarter-finals. Donegal host Derry to see who'll take on Tyrone in the last four.

Connacht SFC:

With Galway awaiting the winners in the provincial final, Mayo welcome Leitrim to MacHale Park for the second Connacht SFC semi-final.

It's a little bit quieter than usual today, with just two matches taking place in the senior football championship - but they are both vitally-important clashes to the counties involved!