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PJ: What a horrible start to the game. One ball from their defence and we're cut wide open at the back. Shocking!

Paul: For a team that sets up in a defensive manner, it's amazing how terrible Manchester United are at defending.

Mike: Sanchez has not progressed since his arrival. Jose out!

Phil McNulty
BBC Sport chief football writer at Wembley

Dele Alli arrived with perfect timing for a typical finish - but what a build up from Davinson Sanchez and Christian Eriksen.

Spurs are looking sharper and there was a loud groan of frustration from Manchester United's fans when Romelu Lukaku was far too slow to react to a ball played up to him, allowing Spurs to launch another dangerous attack.

These are dangerous times for Jose Mourinho's side. Spurs are threatening to run riot.

Image source, Reuters

Phil Jones with a last ditch tackle on Dele Alli to stop the midfielder scoring his second.

Then moments later Harry Kane tees up Christian Eriksen who drags his shot wide.

Spurs rampant.

United are rocking here.

Son Heung-Min with a wonderful pass to the back post for Harry Kane, but he can't quite reach it to tap in.

Danny Murphy
Former England midfielder on BBC One

We talked about Christian Eriksen being able to create opportunities and pick the right pass. He has no right to get in behind there.

But what a pass that is to Dele Alli. That's the difference with top players like Eriksen and it's sparked a great atmosphere inside Wembley.

First big chance.

Nemanja Matic clips the ball to Romelu Lukaku in the box, the Belgium has a free header but sticks it over.

Jose Mourinho turns away in despair.

Image source, Reuters

Victor: Questioning whether Alexis is the right choice, other than the City game he hasn't done enough in big games.

Wahl: None of the Man Utd fans that are slating Jose pre-game have the right to celebrate after we win today

Nick: Both teams at full strength...No excuse from either...This is going all the way

Phil McNulty
BBC Sport chief football writer at Wembley

It is now an annual debate about whether the FA Cup has lose some of its old lustre - not much sign of that inside Wembley for this first semi-final.

There is a crackling atmosphere, a wall of sound and the early exchanges have demonstrated just how much this means to Manchester United and Spurs.

Another corner to United after some good running by Jesse Lingard, but the danger is cleared.

Breathless start here.

What Murphy is referring to was a challenge on Alexis Sanchez by Trippier that left the Chilean on the deck.

Spurs chose not to put the ball out and continued to attack.

Danny Murphy
Former England midfielder on BBC One

It's been a bright start by Spurs but Kieran Trippier is lucky to get away with that challenge on Alexis Sanchez. That was naughty.

United manage to get out of their own half as Ander Herrera lobs one up the pitch.

Davinson Sanchez heads it out under pressure from Romelu Lukaku.

Herrera then sends another long pass into the box and United have their first corner, but Spurs manage to clear.

Harry Kane shows he is in the mood, turning away from Ander Herrera, running at goal and unleashing a shot that wins a corner.

Paul Pogba adverts danger, but Spurs are straight back at them as Son Heung-Min has another go at United, and wins a corner off Antonio Valencia.

That corner is also cleared and United can breathe for now.

Here we go!

Last few handshakes from the players, some fans look nervous.

Teatime football on a Saturday - this does not get any better.

Let's hope it's a cracker.

Manchester United boss Jose Mourinho is asked about his last visit to Wembley, a 2-0 defeat to Tottenham, with Christian Eriksen scoring after 11 seconds.

"The other game started 1-0. I hope this one starts 0-0. They are a very good team, to start 1-0 is very difficult," jokes the Portuguese.

Image source, Getty Images

Image source, Getty Images

Our old friend video assistant referee is back for the semi-final. Confusion may reign at some stage.

Here is five things to do while waiting for a VAR decision...

BBC Radio 5 live

Former England winger Chris Waddle joins Jonathan Overend and John Murray at Wembley.

You can listen to live commentary on 5 live by clicking the tab at the top of this page.