Willie Miller
Former Aberdeen defender on BBC Sportsound

Craig Levein
Former Dundee United manager on BBC Sportsound

Willie Miller
Former Aberdeen defender on BBC Sportsound

Dundee United manager Micky Mellon tells BBC Scotland: "Fantastic performance. Dundee United are back in the semi-finals, where they should be all the time.

"They showed what they're capable of. Their work-rate was fantastic and they got whet they deserved."

Image source, SNS

Dundee United striker Marc McNulty tells BBC Scotland: "Probably our best performance at a team this season.

"Clean sheet, never really gave them too much. Buzzing to get into the next round. It's a good trip to Hampden and fingers crossed we get a good tie."

Image source, SNS

Tyrone Smith
BBC Scotland at Pittodrie Stadium

A resounding win for Dundee United, utterly dominant from start to finish. Rock solid at the back, not that the Tangerine's rearguard had much to do, and razor sharp at the top. A great day all round. As for Aberdeen, outplayed, out fought and out of the cup.

Aberdeen will be missing from the Scottish Cup semi-finals for the first time in five years.

The home side can have no complaints as they were rarely in the game from the second Marc McNulty applied the first of two fine finishes early in the first half.

A Ryan Edwards header amplified their first-half dominance, with McNulty ending the Dons' resistance after the break.

United missed out on a top-six place in the Premiership, but they are into their first Scottish Cup semi-final since 2016. New Aberdeen boss Stephen Glass' hopes of matching predecessor Derek McInnes by starting his tenure by lifting a trophy are dashed.

Image source, SNS

Another unnecessary booking and Lewis Smith goes into the book for a foul on Lewis Ferguson as we enter stoppage time.

Willie Miller
Former Scotland defender on BBC Sportsound

On-loan Manchester City midfielder Luke Bolton and striker Louis Appere come on for United and strike duo Lawrence Shankland and Nicky Clark come off for a well-earned rest having steered United to a fine win.

The game is petering out towards an inevitable conclusion with United destined for the Scottish Cup semi-finals.

Aberdeen's have been lacklustre in their attempt to come back into the game.

Calum Butcher has been walking a tightrope in recent minutes having already been booked and manager Micky Mellon takes no chances by replacing the Englishman with fellow midfielder Peter Pawlett.

United midfielder Ian Harkes goes into the referee's book.

A bit silly for the American as the game already looks won.

Could it be an indication that Aberdeen manager Stephen Glass does not see his side coming back from this that he brings on 19-year-old Michael Ruth for ineffectual on-loan St Johnstone striker Callum Hendry?

That's the former Arbroath loanee's second Dons appearance.

Craig Levein
Former Dundee United manager on BBC Sportsound

It's the first time Aberdeen have lost three at Pittodrie since September against Motherwell and they have only managed three of their own once this season - in October in a 3-3 draw with Celtic.

Now they have to score three without reply in 20 minutes or they are exiting the Scottish Cup.

New Aberdeen coach Allan Russell is the latest to feel the wrath of referee Kevin Clancy for something he has said.

The man lauded for his work with England's strikers before the recent move to Pittodrie must be realising he has a big task on his hand in making improvements in Aberdeen.

Aberdeen manager Stephen Glass looks to change the course of the game with a couple of substitutions, although it might already be too late.

Dylan McGeouch and Ethan Ross replace Niall McGinn and Dean Campbell in midfield.

Aberdeen defender Andrew Considine shows his frustration as he takes out Lawrence Shankland.

That comes after another booking, this time for United double scorer Marc McNulty.