Ryan Bertrand is the latest Southampton player to get his name taken by referee Jon Moss. He catches Joao Mario late as the Portuguese went to hook the ball clear.

The sun is out at London Stadium as West Ham continue to pass the ball around calmly. A metaphor for the situation at the Hammers?

The ring of stewards is still in place around the playing surface but the home fans are in celebratory mood today.

Nothing is going right for Southampton. Mario Lemina thinks he has won a throw-in but the referee gives it West Ham's way. Lemina then punches the ball away in frustration and gets a yellow card for his troubles.

Pat Nevin
Former Chelsea winger on BBC Radio 5 live

Southampton have started the second half quite well and they have pushed on a bit. Shane Long could bring a change

A shot from Southampton! Charlie Austin hasn't had a sniff so far but he's played in by Shane Long and gets an effort away but it's blocked over the bar. Joe Hart punches away the following corner and then positively comes to claim a cross a few moments later.

And the corner is completely wasted. Little change from Southampton after the break.

Corner to Southampton. If they are to get anything from this match then they need a goal quick.

Neil: Only decision worse than sacking Puel for Pelligrini was then sacking Pelligrini for Hughes.

Dan: Mark Hughes well on his way to getting two teams relegated in one season

Steve: Not Mark Hughes fault if Southampton go down... That honour lies with lack of action from owners to replace Mauricio Pellegrino soon enough...

Image source, Reuters

Unsurprisingly Southampton are making a change at half-time. Shane Long replaces the ineffective Manolo Gabbiadini.

Back under way.

Southampton have not had a shot so far. Their passing accuracy is down at 65%. They have only had two touches in the West Ham penalty area.

Mark Hughes will not be happy.

Marsel: That 3rd goal by West Ham was beautiful. Arnautovic is phenomenal on his day

John: Marko hat trick coming up

Pat Nevin
Former Chelsea winger on BBC Radio 5 live

Image source, Reuters

Another fantastic goal.

It's not just the fact West Ham are creating chances but it's the confidence and the belief they are playing with. They have scored three three brilliant goals.

That is one of the best crosses you will see this season and it is impossible to defend against.

I cannot see a way back into this for Southampton now.

Simon Stone
BBC Sport at the London Stadium

That couldn't have gone much better for David Moyes. And it hasn't gone any better for West Ham United in this stadium.

West Ham United have never scored three times - or taken a three-goal lead - by half-time in a Premier League game since they have been in the London Stadium.

West Ham are up to 14th as it stands. Southampton are still 18th and are two points away from safety.

And that is half-time. What a difference a few weeks make.

There'll be five minutes added time after those earlier injuries for West Ham. I can pretty confidently say that Southampton will not score before the break. They've been woeful.

The home fans are really getting behind West Ham here. Aaron Creswell gets too much on a cross from the left but he's still passionately applauded for his efforts. There has been no sign of the unrest of recent weeks so far.

Pat Nevin
Former Chelsea winger on BBC Radio 5 live

David Moyes probably wants another goal here because it kills it stone dead, and they've deserved a third because they are the team on top.

Image source, Reuters

Arthur Masuaku has been really good in this opening period in the left-wing back position. He wins a free-kick in a dangerous position but Joao Mario hits it straight over the bar. That's the first thing the Portuguese has done wrong all game.