West Ham get a chance to keep hold of the ball for a bit. Michail Antonio goes down, but I think he slipped in trying to control. Back come Chelsea...

Chelsea work the ball left again for Mason Mount but his cross is blocked. Good work from West Ham. They were being dragged about but kept their discipline.

James Collins
Former West Ham defender on BBC Radio 5 Live

West Ham are sitting off and allowing Chelsea that first pass, but as soon as the first pass goes the front three of West Ham are really pressing and they've caught Chelsea out a few times already.

West Ham have grown into the game a little.

West Ham having to dig in for periods here, as you'd expect. Chelsea have so much talent and are so able to whip the ball around efficiently at speed. So hard to defend against.

Mason Mount is popping up all over the shop.

Chelsea drive forward again. Kai Havertz pokes a low cross wide from close range, but it wouldn't have counted. The forward moved a touch early to go offside.

Chelsea's turn to threaten.

Reece James' shot from range is on target but saved by Lukasz Fabianski. Started well this. Good game.

James Collins
Former West Ham defender on BBC Radio 5 Live

West Ham have been camped in a bit in their own half and Chelsea are enjoying possession, nice and patient.

Declan Rice has started well - he's breaking the play up when the ball does get to the edge of the box.

The Hammers are warming to this.

Michail Antonio swings over a cross that Tomas Soucek meets but glances wide with his head. The midfielder scored midweek against Brighton and he was in the hunt again there.

West Ham's first real charge forward ends with Jarrod Bowen carrying the ball to the edge of the box before slicing his shot just wide.

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Chance!

Reece James' cross deflects to Hakim Ziyech but he can only poke a tame shot that deflects to Lukasz Fabianski.

Bobby: I was at the London Stadium when West Ham overpowered Liverpool - a magical event. It felt like anything was possible. Three games later, and we've only picked up 1 point. Hopefully the arrival of leaders Chelsea will make us raise our game for the derby.

Ruben Loftus-Cheek is adjudged to have been fouled by Manuel Lanzini to halt a West Ham attack. David Moyes is already up and raging at the officials.

West Ham battling for a foothold. Chelsea pressing effectively high.

Image source, Getty Images

Karen Carney
Former Chelsea midfielder on BBC Radio 5 Live

Jorginho isn't blessed with lots of pace, but he makes up for that with his game intelligence.

He rarely has to get in a footrace because he sees things before they happen. He reads things, he breaks things up, he sets people on their way.

Antonio Rudiger goes all Joao Cancelo on us, attempting an outside of the boot pass into the box. Massively over-hits it, though. That's Lukasz Fabianski's ball.

Reece James delivers the free-kick into the box but there is Declan Rice again, using that sixth sense once more to snuff out danger.

The visitors have started on the front foot. They have a free-kick in West Ham territory for a foul on the advanced Reece James.

As the few remaining bubbles float into the London sky, Chelsea come forward but Declan Rice cuts out a cross from Mason Mount from the left.

Game on. A big game to get the ball rolling today. Can Chelsea stay top, or will West Ham chuck another spanner in the title race?

Image source, Getty Images

Here come the teams. You ready for some football?