PETER MCDOWALL: Here we go then, England's two most decorated teams,
the biggest game in club football gets another outing here this afternoon,
a Liverpool team coming up against an out-of-form United,
out of luck where recent games against Liverpool are concerned,
just one win in 10, they haven't won any of the last six.
A win would certainly provide a shot across the bows for either team,
a real statement, both teams had to go to the well in midweek -
which has recovered best?
GARY GILLESPIE: Liverpool probably coming here as big favourites,
but what you have to expect is United, they do have dangerous players in good areas.
PETER: And the big surprise comes
at the heart of Liverpool's defence,
Ibrahima Konate coming in for Joel Matip,
it's the same midfield that started
against Atletico Madrid in the week,
Fabinho has a knee problem.
Firmino always starts against United,
and that doesn't change,
but Sadio Mane drops to the bench
and Diogo Jota starts tonight.
Same United team that beat Atalanta,
Ole Gunnar Solskjaer saying they were strong, created enough chances
to win the game even before the late rally,
it also means that Paul Pogba
and Jadon Sancho drop to the bench.
Two teams feeling each other out in the opening exchanges.
Manchester United sense a break here,
big chance for Fernandes!
Maybe came too early for him but real signs of danger in the opening minutes.
GARY: I don't think it should overly concern Liverpool,
they have conceded chances in recent games and relied on their goalkeeper,
especially against Atletico in midweek, when Alisson had a fantastic game.
But it's all about the teamwork and the goalkeeper is included in that.
PETER: This is what Manchester United feared, as Liverpool commit bodies forward,
big chance for Keita!
And Liverpool have the advantage!
So much talk about him during the week, he may feel he still has some point to prove,
but no question about his eye for goal, it's his second this week.
GARY: It does look as if Salah is onside,
and Keita just sticks it to the side of De Gea.
What a wonderful start for Liverpool.
PETER: The start we all wanted.
Liverpool in the ascendancy against a team that have had so much criticism.
Liverpool again, and it's that man again, Keita,
Bobby Firmino with the chance!
Big save.
It was almost like a heavyweight boxing match, United almost ready to be stopped.
Fred.
Mason Greenwood, it's a bobbler.
Just wide of the post from Rashford.
Early sighter for him.
GARY: Speculative. Liverpool give it away needlessly.
PETER: Was there an element of kidology about Solskjaer before the game?
He will have known Liverpool would have lots of the ball.
And United are all over the place at the back, Trent Alexander-Arnold's cross!
And it's two, and Manchester United on the ropes courtesy of Diogo Jota!
And Manchester United are absolutely shellshocked by this Liverpool start.
GARY: Absolutely out of this world, Liverpool.
What a mix-up between the defenders, Shaw and Maguire,
then it's a wonderful ball into the area and Jota is outstretched at the far post.
PETER: Shooting opportunity perhaps for Shaw here...
Couple of inches wide of the post.
Slowly but surely from United.
GARY: The build-up creates an overlap.
Shaw doesn't quite catch it on the outside of his left foot.
PETER: Greenwood again, and it was spinning all over the place.
Again he was equal to it, the big Brazilian, but they've sensed something, United.
Were 2-0 down in the week and of course got it back to 3-2.
Inexplicable ball and Mo Salah's onto it, might have to go on his own!
Against the chest of the United keeper, he's frustrated with himself, Salah,
but it was the only option open to him really.
Henderson.
Keita again.
One touch, lovely to watch again,
still might break here, Naby Keita again!
It's three! Keita with the buffet ball for Mo Salah,
who just smashes it into the back of United's net,
he's smashing records for fun,
31 goals last season, you'd back him to better it this season.
A terrific start from this Liverpool team.
GARY: He just can't stop scoring,
fantastic stuff from Liverpool.
Shaw goes to sleep and doesn't react,
certainly not as fast as Salah, hence why the little Egyptian makes it 3-0.
PETER: Into the added-on time.
Is there still time?
Looking for Diogo Jota, it's a bobbler!
And it's four for Liverpool, Salah has done it again!
It was a dream scenario to think we might have another goal in us before half-time,
but we did, and the head shake says it all.
Liverpool have been absolutely devastating, and Salah at the very centre of it.
GARY: When you're this clinical in front of goal, no team can live with you,
but certainly not Manchester United the way they're defending at this moment in time.
All credit to Salah, this is not easy,
an absolutely outstanding finish
from an absolutely outstanding player.
PETER: Ole Gunnar Solskjaer was talking in the lead up about whether
they could be title challengers, and of course if they'd won today
they would have moved within a point of Liverpool,
and he spoke about there not being any time to lose.
Well, they lost that first half, it wasn't even a contest in the end.
Henderson tried one round the corner, that is absolutely beautiful from Henderson,
and it's Mohamed Salah again.
Absolutely ridiculous from Liverpool's No. 11.
Another Old Trafford goal, it's his sixth in as many games here.
No other Liverpool player has scored at the level he is scoring at,
and not least at Old Trafford.
Five for Liverpool.
GARY: That is an incredible pass from Jordan Henderson,
that wouldn't have happened five years ago,
and he has a willing runner,
Salah sometimes misses a couple but the majority find the back of the net.
Liverpool on easy street now.
PETER: Fernandes' ball spun into the box,
one of the few involvements Van Dijk has had.
Liverpool will want to guard this clean sheet like their life depends on it though,
and can they here?
Ronaldo gets one back.
It won't make it a contest. This will be checked as well.
GARY: That might be chalked off,
did look a hint of offside.
PETER: It would rub salt in the wound, wouldn't it?
And the goal has been ruled out for offside.
You called it right, Gary, it just goes from bad to worse for United.
That's a dangerous challenge by Pogba, what will the referee do here?
Another yellow card.
It looked as thought it was two feet.
Got away with one there, hasn't he?
He's going to check this for a possible red card, Anthony Taylor.
This would maybe suggest he's going to overturn his decision and make it a red card.
Yeah, and the yellow is withdrawn,
and Paul Pogba will be sent off here.
GARY: I presume those are Manchester United supporters,
on their way home or on their way to the pub.
PETER: Evidence everywhere of that Liverpool ruthlessness.
Trent Alexander-Arnold!
It was headed towards the top bin...
before De Gea's intervention.
The ball just died at the last minute, Trent struck it right on the valve.
People will talk about what happens next to Man United and their manager,
not a big concern of ours tonight.
Keita after five minutes, Jota after 13, a Mohamed Salah hat-trick,
it was a stunning performance.