We're back next Sunday, 21 June, with the first of the semi-finals as last year's beaten finalists and 2013 winners Monaghan take on Fermanagh. Hope to see you then.
Post update
Oisin McConville
BBC Sport NI GAA analyst
"We were just not good enough. We were bullied and outfought.
"Kieran McGeeney has reinvigorated the team and supporters but all that has been dashed.
"Armagh froze and there are very few positives to take out of this game."
Post update
Martin McHugh
BBC Sport NI GAA analyst
"The first goal finished the game - it was big score, it made all the difference and Armagh never recovered from it. The first-half performance from Donegal was very good."
Full-time
Armagh 0-8 Donegal 2-11
Odhrán Mac Niallais scores what proves to be the final point. A comprehensive win for Donegal who go forward to take on Derry in the semi-finals.
Via Twitter
"Cannot believe Armagh fans are leaving the Athletic Grounds with 10 minutes to go. What has taken them so long?" - Sean Perry is in a mischievous mood on Twitter.
Black card
Armagh's Aaron Findon gets to leave the action a few minutes from time as he is black-carded for a tackle from behind.
Exit strategy
Armagh 0-8 Donegal 2-10
The Armagh fans streaming out of the Athletic Grounds have missed Tony Kernan score their county's eighth point.
Maybe they're away to see how the Meath v Wicklow game is going - because Armagh will meet the losers in the qualifiers.
Post update
Paddy Bradley
Derry All Star
"Donegal will be looking to get through the last 10 minutes unscathed so they will be happy to coast it to the end."
Post update
Armagh 0-7 Donegal 2-10
Another free by Michael Murphy sees Donegal enjoy a commanding and unassailable advantage.
James Morgan replies for Armagh from play. Game James is sticking to the task.
Three in a row
Armagh 0-6 Donegal 2-9
Well now, three points in a row for Armagh. Caolan Rafferty scores, followed by frees from Ethan Rafferty and Tony Kernan.
Post update
Paddy Bradley
Derry All Star
"That's a beautiful finish from Martin O'Reilly. He's been quiet today but has popped up with the goal to finish the game."
Goal
Armagh 0-3 Donegal 2-9
Donegal score their second goal and they're as good as in the semi-finals.
Martin O'Reilly rounds the keeper to leave 12 points between the sides.
Press EyeCopyright: Press Eye
Martin O'Reilly celebrates after beating Armagh keeper Andrew McNeiceImage caption: Martin O'Reilly celebrates after beating Armagh keeper Andrew McNeice
Point for Armagh
Armagh 0-3 Donegal 1-9
Ciaran McKeever finishes well from a difficult angle.
Close!
Agony for Armagh
It is just not Armagh's day. Their star turn Jamie Clarke drives at the Donegal defence but sees his shot strike a post. The rebound falls to Stefan Campbell who shoots into the side-netting.
Armagh's new sweeper?
BBC SportCopyright: BBC Sport
Have Armagh found their secret weapon, in an attempt to mop things up at the back?
Curtain raiser
The Intermediate Camogie final was staged before the big game and the result was Armagh 6-09 Tyrone 2-09
Interval analysis
Orla Bannon
BBC Sport at the Athletic Grounds
An outstanding half of football by Donegal. Easily the best we've seen this summer.
Rory Gallagher called his players into a huddle at the end of the first half before they walked off with their game faces on. The scoreboard says it's over but judging by their faces, they intend to inflict even more misery on Armagh in the second half.
Post update
Oisin McConville
BBC Sport NI GAA analyst
"The amount of times Armagh have turned the ball over is scary. We needed a good start to the game but got anything but.
"The major threat is the ball into Paddy McBrearty and we haven't covered that."
Post update
Martin McHugh
BBC Sport NI GAA analyst
"That's probably the best half of football from Donegal since the Jim McGuinness era. They are controlling the midfield and have had six different scorers.
"Everything is going right for Donegal while Armagh look very nervous. Experience the difference."
Post update
Paddy Bradley
Derry All Star
"Ten points between the sides - no-one could have predicted this. Donegal dictating the pace of the game."
That's incredible!
Armagh 0-2 Donegal 1-9
Another Michael Murphy free brings the curtain down on a first half Armagh will want to forget. Ten points the difference - not the full-blooded, close contest which had been predicted.
Via Twitter
"Donegal looking very strong and fresh compared to this time last year. Contenders for the All Ireland surely?" - former (apparently) Down forward Benny Coulter
"Armagh's failure to pick up their runners is killing them. Toye, McGlynn and Lacey are cutting them to ribbons. It is very impressive from Donegal" - former Tyrone star Philip Jordan
Karl makes mark
Armagh 0-2 Donegal 1-8
Half-back Karl Lacey gets into the scoring act for Donegal, splitting the posts from a testing angle on the right side.
Post update
Armagh 0-2 Donegal 1-7
A rare breed has been spotted at the Athletic Grounds! A point for Armagh.
Nice finish by forward Tony Kernan with the outside of his boot. But 28 minutes have gone and Kieran McGeeney's men have managed just two points. They are the little matter of eight behind.
Post update
Paddy Bradley
Derry All Star
"The big difference between the sides is that when Donegal attack, they do so in numbers. But when Armagh attack it is one man in isolation - there is no support."
All one direction
Armagh 0-1 Donegal 1-7
A high challenge is punished and full-forward Michael Murphy lands another free for Donegal. Any Armagh misdemeanour seems to getting punished by Rory Gallagher's men.
Is this game over - 10 minutes before half-time? Patrick McBrearty gets away from marker James Morgan to lift over another impressive score.
Post update
BBCCopyright: BBC
"Armagh may have trained hard and prepared well (apparently) but you win nothing if you cant do the basics!" - Mattie on Twitter
Post update
Armagh 0-1 Donegal 1-5
Skipper Murphy sends over a monster free for Donegal. The home support were vocal earlier on, but seem stunned now. They cannot believe their boys are seven points down after 20 minutes.
Post update
Armagh 0-1 Donegal 1-4
At last! Armagh score their first point in the 14th minute. Ethan Rafferty's attempt at a point falls short - but fellow midfielder Aaron Findon fists over the bar.
But the six-point gap is restored as talented half-forward Odhrán Mac Niallais slots over a delightful score from the left. Classy point from the highly-rated 22-year-old from Letterkenny.
Post update
Paddy Bradley
Derry All Star
"Armagh are enjoying plenty of possession but they just can't break down this Donegal defence."
Post update
Armagh 0-0 Donegal 1-3
Another score for dominant Donegal as Martin McElhinney works some space to send over a lovely left-footed effort.
All Donegal
Armagh 0-0 Donegal 1-2
Neil Gallagher scores a fine point from play and skipper Michael Murphy hoists an accurate free from out on the left to put the Ulster champions five points to the good. Armagh need a score - and they need it soon.
Post update
Paddy Bradley
Derry All Star
"That was a brilliant catch from Paddy McBrearty and an excellent finish. It's been a very nervous start from Armagh.
"They need to settle down because everything is rushed at the minute."
Goal
Armagh 0-0 Donegal 1-0
Great start for Donegal as Paddy McBrearty finds the net. The corner-forward made a superb catch and, when his first shot was saved by Armagh keeper Matthew McNeice, 21-year-old McBrearty squeezed a left-foot shot in from a tight angle.
Post update
Oisin McConville
BBC Sport NI GAA analyst
"I fancy Donegal to edge it - they have a bit more experience than Armagh."
Post update
Martin McHugh
BBC Sport NI GAA analyst
"Frank McGlynn is a big, big player for Donegal. He is the link man and Armagh will have to put a player on him."
Crowded house
It is a sell-out for this big game at the Athletic Grounds
Post update
Oisin McConville
BBC Sport NI GAA analyst
"It's all about getting the ball into Jamie Clarke. If Armagh can do that then they have a chance."
Team news
Armagh: M McNeice; F Moriarty, C Vernon, A Mallon; J Morgan, C McKeever, S Campbell; A Findon, E Rafferty; C Rafferty, M McKenna, A Forker; A Murnin, T Kernan, J Clarke.
Donegal: P Durcan; P McGrath, N McGee, E McGee; M McHugh, K Lacey, F McGlynn; N Gallagher, M McElhinney; C Toye, O MacNiallais, R McHugh; P McBrearty, M Murphy, M O'Reilly.
Kevin Dyas is missing for Armagh - a blow for them - while Mark McHugh returns in place of Anthony Thompson for Donegal.
One to watch
Donegal's dangerman
InphoCopyright: Inpho
Three of Michael Murphy's six Championship goals have been penaltiesImage caption: Three of Michael Murphy's six Championship goals have been penalties
Donegal's top forward Michael Murphy is in action this afternoon, so the Armagh defence will have their hands full. The 25-year-old Glenswilly clubman has scored six goals and 120 points in his 38 Championship appearances.
Starting soon
The Athletic Grounds host the last of the 2015 Ulster Senior Football Championship quarter-finals as Armagh take on holders Donegal.
There is a feelgood factor among Armagh supporters in what is their first Championship campaign under Kieran McGeeney, their former All Star defender.
McGeeney is the only Orchard County county skipper to have lifted the All-Ireland Championship trophy, the Sam Maguire. A return to the heady days of 2002 may be a little way off, but home supporters will be expecting Armagh to pose a serious challenge to Donegal.
Having seen off Tyrone in the first round, Donegal are favourites to progress this afternoon.
Live Reporting
Lyle Jackson
All times stated are UK
Get involved
Press EyeCopyright: Press Eye Martin O'Reilly celebrates after beating Armagh keeper Andrew McNeiceImage caption: Martin O'Reilly celebrates after beating Armagh keeper Andrew McNeice 
BBC SportCopyright: BBC Sport 
BBCCopyright: BBC 
InphoCopyright: Inpho Three of Michael Murphy's six Championship goals have been penaltiesImage caption: Three of Michael Murphy's six Championship goals have been penalties
Latest PostThat's all folks
Thanks for following our coverage. You can see match photos here.
We're back next Sunday, 21 June, with the first of the semi-finals as last year's beaten finalists and 2013 winners Monaghan take on Fermanagh. Hope to see you then.
Post update
Oisin McConville
BBC Sport NI GAA analyst
"We were just not good enough. We were bullied and outfought.
"Kieran McGeeney has reinvigorated the team and supporters but all that has been dashed.
"Armagh froze and there are very few positives to take out of this game."
Post update
Martin McHugh
BBC Sport NI GAA analyst
"The first goal finished the game - it was big score, it made all the difference and Armagh never recovered from it. The first-half performance from Donegal was very good."
Full-time
Armagh 0-8 Donegal 2-11
Odhrán Mac Niallais scores what proves to be the final point. A comprehensive win for Donegal who go forward to take on Derry in the semi-finals.
Via Twitter
"Cannot believe Armagh fans are leaving the Athletic Grounds with 10 minutes to go. What has taken them so long?" - Sean Perry is in a mischievous mood on Twitter.
Black card
Armagh's Aaron Findon gets to leave the action a few minutes from time as he is black-carded for a tackle from behind.
Exit strategy
Armagh 0-8 Donegal 2-10
The Armagh fans streaming out of the Athletic Grounds have missed Tony Kernan score their county's eighth point.
Maybe they're away to see how the Meath v Wicklow game is going - because Armagh will meet the losers in the qualifiers.
Post update
Paddy Bradley
Derry All Star
"Donegal will be looking to get through the last 10 minutes unscathed so they will be happy to coast it to the end."
Post update
Armagh 0-7 Donegal 2-10
Another free by Michael Murphy sees Donegal enjoy a commanding and unassailable advantage.
James Morgan replies for Armagh from play. Game James is sticking to the task.
Three in a row
Armagh 0-6 Donegal 2-9
Well now, three points in a row for Armagh. Caolan Rafferty scores, followed by frees from Ethan Rafferty and Tony Kernan.
Post update
Paddy Bradley
Derry All Star
"That's a beautiful finish from Martin O'Reilly. He's been quiet today but has popped up with the goal to finish the game."
Goal
Armagh 0-3 Donegal 2-9
Donegal score their second goal and they're as good as in the semi-finals.
Martin O'Reilly rounds the keeper to leave 12 points between the sides.
Point for Armagh
Armagh 0-3 Donegal 1-9
Ciaran McKeever finishes well from a difficult angle.
Close!
Agony for Armagh
It is just not Armagh's day. Their star turn Jamie Clarke drives at the Donegal defence but sees his shot strike a post. The rebound falls to Stefan Campbell who shoots into the side-netting.
Armagh's new sweeper?
Have Armagh found their secret weapon, in an attempt to mop things up at the back?
Curtain raiser
The Intermediate Camogie final was staged before the big game and the result was Armagh 6-09 Tyrone 2-09
Interval analysis
Orla Bannon
BBC Sport at the Athletic Grounds
An outstanding half of football by Donegal. Easily the best we've seen this summer.
Rory Gallagher called his players into a huddle at the end of the first half before they walked off with their game faces on. The scoreboard says it's over but judging by their faces, they intend to inflict even more misery on Armagh in the second half.
Post update
Oisin McConville
BBC Sport NI GAA analyst
"The amount of times Armagh have turned the ball over is scary. We needed a good start to the game but got anything but.
"The major threat is the ball into Paddy McBrearty and we haven't covered that."
Post update
Martin McHugh
BBC Sport NI GAA analyst
"That's probably the best half of football from Donegal since the Jim McGuinness era. They are controlling the midfield and have had six different scorers.
"Everything is going right for Donegal while Armagh look very nervous. Experience the difference."
Post update
Paddy Bradley
Derry All Star
"Ten points between the sides - no-one could have predicted this. Donegal dictating the pace of the game."
That's incredible!
Armagh 0-2 Donegal 1-9
Another Michael Murphy free brings the curtain down on a first half Armagh will want to forget. Ten points the difference - not the full-blooded, close contest which had been predicted.
Via Twitter
"Donegal looking very strong and fresh compared to this time last year. Contenders for the All Ireland surely?" - former (apparently) Down forward Benny Coulter
"Armagh's failure to pick up their runners is killing them. Toye, McGlynn and Lacey are cutting them to ribbons. It is very impressive from Donegal" - former Tyrone star Philip Jordan
Karl makes mark
Armagh 0-2 Donegal 1-8
Half-back Karl Lacey gets into the scoring act for Donegal, splitting the posts from a testing angle on the right side.
Post update
Armagh 0-2 Donegal 1-7
A rare breed has been spotted at the Athletic Grounds! A point for Armagh.
Nice finish by forward Tony Kernan with the outside of his boot. But 28 minutes have gone and Kieran McGeeney's men have managed just two points. They are the little matter of eight behind.
Post update
Paddy Bradley
Derry All Star
"The big difference between the sides is that when Donegal attack, they do so in numbers. But when Armagh attack it is one man in isolation - there is no support."
All one direction
Armagh 0-1 Donegal 1-7
A high challenge is punished and full-forward Michael Murphy lands another free for Donegal. Any Armagh misdemeanour seems to getting punished by Rory Gallagher's men.
Is this game over - 10 minutes before half-time? Patrick McBrearty gets away from marker James Morgan to lift over another impressive score.
Post update
"Armagh may have trained hard and prepared well (apparently) but you win nothing if you cant do the basics!" - Mattie on Twitter
Post update
Armagh 0-1 Donegal 1-5
Skipper Murphy sends over a monster free for Donegal. The home support were vocal earlier on, but seem stunned now. They cannot believe their boys are seven points down after 20 minutes.
Post update
Armagh 0-1 Donegal 1-4
At last! Armagh score their first point in the 14th minute. Ethan Rafferty's attempt at a point falls short - but fellow midfielder Aaron Findon fists over the bar.
But the six-point gap is restored as talented half-forward Odhrán Mac Niallais slots over a delightful score from the left. Classy point from the highly-rated 22-year-old from Letterkenny.
Post update
Paddy Bradley
Derry All Star
"Armagh are enjoying plenty of possession but they just can't break down this Donegal defence."
Post update
Armagh 0-0 Donegal 1-3
Another score for dominant Donegal as Martin McElhinney works some space to send over a lovely left-footed effort.
All Donegal
Armagh 0-0 Donegal 1-2
Neil Gallagher scores a fine point from play and skipper Michael Murphy hoists an accurate free from out on the left to put the Ulster champions five points to the good. Armagh need a score - and they need it soon.
Post update
Paddy Bradley
Derry All Star
"That was a brilliant catch from Paddy McBrearty and an excellent finish. It's been a very nervous start from Armagh.
"They need to settle down because everything is rushed at the minute."
Goal
Armagh 0-0 Donegal 1-0
Great start for Donegal as Paddy McBrearty finds the net. The corner-forward made a superb catch and, when his first shot was saved by Armagh keeper Matthew McNeice, 21-year-old McBrearty squeezed a left-foot shot in from a tight angle.
Post update
Oisin McConville
BBC Sport NI GAA analyst
"I fancy Donegal to edge it - they have a bit more experience than Armagh."
Post update
Martin McHugh
BBC Sport NI GAA analyst
"Frank McGlynn is a big, big player for Donegal. He is the link man and Armagh will have to put a player on him."
Crowded house
It is a sell-out for this big game at the Athletic Grounds
Post update
Oisin McConville
BBC Sport NI GAA analyst
"It's all about getting the ball into Jamie Clarke. If Armagh can do that then they have a chance."
Team news
Armagh: M McNeice; F Moriarty, C Vernon, A Mallon; J Morgan, C McKeever, S Campbell; A Findon, E Rafferty; C Rafferty, M McKenna, A Forker; A Murnin, T Kernan, J Clarke.
Donegal: P Durcan; P McGrath, N McGee, E McGee; M McHugh, K Lacey, F McGlynn; N Gallagher, M McElhinney; C Toye, O MacNiallais, R McHugh; P McBrearty, M Murphy, M O'Reilly.
Kevin Dyas is missing for Armagh - a blow for them - while Mark McHugh returns in place of Anthony Thompson for Donegal.
One to watch
Donegal's dangerman
Donegal's top forward Michael Murphy is in action this afternoon, so the Armagh defence will have their hands full. The 25-year-old Glenswilly clubman has scored six goals and 120 points in his 38 Championship appearances.
Starting soon
The Athletic Grounds host the last of the 2015 Ulster Senior Football Championship quarter-finals as Armagh take on holders Donegal.
There is a feelgood factor among Armagh supporters in what is their first Championship campaign under Kieran McGeeney, their former All Star defender.
McGeeney is the only Orchard County county skipper to have lifted the All-Ireland Championship trophy, the Sam Maguire. A return to the heady days of 2002 may be a little way off, but home supporters will be expecting Armagh to pose a serious challenge to Donegal.
Having seen off Tyrone in the first round, Donegal are favourites to progress this afternoon.