59. Walker from long range! Great save by Onana!
The Manchester City captain takes matters into his own hands - or onto his own right foot - with a fierce 30-yard drive, but it's one met by the incredibly strong left hand of the Manchester United goalkeeper.
56. A third change for Manchester City, and it's the most surprising so far.
Kevin De Bruyne has been hauled off by his manager, and on in the Belgian's place is Julian Alvarez.
54. Haaland hits the crossbar!
It's the first time today that the City striker has had sight of goal, and he goes agonisingly close to halving the deficit.
Again, Doku is the catalyst, crossing low from the left, and Haaland responds with a first time strike back across goal and on to the underside of the woodwork.
52. You know things aren't going to plan when ever Phil Foden is fluffing his lines.
Substitute Jeremy Doku drives into the box and crosses to the Premier League Player of the Year, who completely miskicks with his weaker right foot.
52. Now Rodri is required to deter McTominay inside the box.
"I'd go as far to say City have been poor," remarks Ally McCoist.
50. United have been excellent since taking the lead in fortuitous circumstances, and almost open City up in super style again.
Wan-Bissaka's pass, Fernandes' side-step and tackle, Rashford's run.
Only a timely interception by Stones stops the Red Devils in their tracks.
48. Rashford sneaks in behind the City defence, but he is unable to bring down Dalot's raking pass with one touch.
Still, it's a little glimpse of the threat United will carry on the counter.
46. Pep Guardiola has wasted no time in making changes.
As United begin the second half two goals to the good, City have introduced Jeremy Doku and Manuel Akanji for Mateo Kovacic and Nathan Ake.
It's ten years since Arsenal came back from 2-0 down to beat Hull in the FA Cup Final. City will need to produce something similar if they are to complete the double.
City have bossed the ball, prevailed with the passing, but have had just one attempt on target.
There goes the half-time whistle!
45. Scorer of the second United goal, Kobbie Mainoo is now the first player to be cautioned in the cup final.
Referee Andy Madley takes exception to the midfielder's sliding challenge on Kevin De Bruyne.
Meanwhile, there will be two minutes of stoppage time to be played at the end of the first half.
43. City are pouring forward - desperately - trying to find a way back into the game before half-time.
De Bruyne looks for Haaland, but in his eagerness goes too long with the through ball.
41. For the first time today, Pep Guardiola looks rattled.
The City head coach is not happy with how much room Marcus Rashford has been gifted in the first half.
39. Unbelievable!
Kobbie Mainoo doubles Manchester United's lead, and if the first goal was slapstick then this is sheer class!
Bruno Fernandes starts the move in his own half, progressing the ball forward to Mainoo, and then on to Marcus Rashford.
The forward takes over on the near touchline, switching play out to Alejandro Garnacho on the right with a beautiful crossfield pass.
The Argentine then attacks Josko Gvardiol before cutting back to Fernandes, who executes the pass of the season - no-look, no less - by laying it into the path of Mainoo.
The teenager gleefully sidefoots beyond Ortega to set off an explosion of red around Wembley.
City are stunned! United are in dreamland!
38. Marcus Rashford has the ball in the back of the net...
...but the flag is up for offside.
37. Andre Onana makes his first save of the game, making a routine stop to deny Bernardo Silva.
35. Garnacho's goal has certainly opened the game up, and there's every chance that United will find more opportunities on the counter now if City commit men forward.
33. City supporters behind the goal looked shocked as Garnacho rolled the ball home, but it's back to business - just as Pep said pre-game - for their players.
And remember, United took the lead at the Etihad back in March before City fought back to prevail 3-1.
30. Manchester United lead in the FA Cup final!
But while it's a goal scored by the Red Devils, it's one that is completely down to disastrous defending from Manchester City.
Diogo Dalot's long pass forward from left-back has Alejandro Garnacho on the run in hope more than expectation.
However, goalkeeper Stefan Ortega bursts out of his area, too far and too quickly, and at just the moment that Josko Gvardiol overcooks his header back.
The ball loops over the stranded City stopper, presenting Garnacho with an inviting, empty net.
It's not in the class of Ricky Villa or Roberto Di Matteo, but it's an opening goal in an FA Cup Final, and could prove to be absolutely massive.
27. Captains Bruno Fernandes and Kyle Walker exchange words in the centre of the pitch after the Manchester United man is adjudged to have fouled.
Fernandes is now having a moan to referee Andy Madley, but then again, when isn't he?
25. Foden gives us a glimpse of his recent form with some fancy footwork on the edge of the area.
His slick pass sends Kovacic to the byline, from where a pull back is just out of reach of Haaland, allowing Mainoo to cooly clear.
23. Midway through the first half and Erik ten Hag can be very pleased with the manner in which Manchester United have begun.
The Red Devils have been structured out of possession - and they have been out of possession alot - and quick to react when on the ball.
21. More chaos in the Manchester City penalty area, again as a result of the champions attempting to play out from the back.
This time, goalkeeper Ortega finds himself under pressure by United's pressure, and the sky blues eventually need a desperate lunge from Kovacic to deny Fernandes.