Again Arsenal cause problems down the left as this time Kieran Tierney gets through, his low cross is deflected out to Calum Chambers, who smashes a shot well over.

Matheus Pereira swings a free kick into the box and again Darnell Furlong is first to it but again he puts his header wide.

I wouldn't quite say Arsenal are holding on, but West Brom are applying some late pressure now.

A moment of concern for Mikel Arteta as Willian is down injured. He needs a bit of treatment but it looks like he is OK to keep going for now.

A final change for Arsenal as they look to see this out - Dani Ceballos is replaced by Thomas Partey.

Matt Upson
Former England and West Ham defender on BBC Radio 5 Live

They are not going to get many better chances.

Furlong had timed the run really well, but just does not get enough purchase on the ball to hit the target.

Big, big chance for West Brom!

Matt Phillips does well on the left to create a bit of space and fires the ball into the box. Darnell Furlong, six yards out, rises to meet it unchallenged but flicks his header wide of the far post.

Matheus Pereira's goal was West Brom's first shot on target in this game.

He is also the first West Brom player to reach 10 goals in a Premier League season since Saido Berahino in 2014-15 (14).

Dani Ceballos clatters into Conor Gallagher on halfway and is booked as West Brom are awarded a free kick.

The visitors have 20 minutes to find an equaliser and they are the ones doing the attacking at the moment.

West Brom made a change as soon as that goal went in with Grady Diangana on for Callum Robinson.

Matt Upson
Former England and West Ham defender on BBC Radio 5 Live

The smile on big Sam's face says it all, It's an absolutely brilliant goal from Pereira.

He leaves Ceballos chasing his shadow, Gabriel tried to get a block it but he can't. He shoots across goal and it's in off the post. Inch perfect.

Does it give West Brom a lifeline?

Bukayo Saka fizzes in cross number 1,532 of the game and Alexandre Lacazette is inches away from turning it home. The flag then goes up for offside anyway.

Another change for Arsenal as Kieran Tierney comes on for Emile Smith Rowe, who opened his Premier League account with tonight's first goal.

Hal Robson-Kanu is booked as he catches Mohamed Elneny, who is left with a cut on his lip as a result.

Matt Upson
Former England and West Ham defender on BBC Radio 5 Live

Where did that chance come from again? Saka down the left. He is causing havoc whenever he chooses.

It is such a whipped cross into the box but both players running in are just half a yard off contact.

That's it for Gabriel Martinelli as he is replaced by Alexandre Lacazette for the remaining 30 minutes.

From the fourth corner, Arsenal break and Bukayo Saka drives another excellent ball across the face of goal but neither Gabriel Martinelli and Emile Smith Rowe are able to turn in.

A decent spell for West Brom sees them win three corners in quick succession, the last one the best of the lot as Bernd Leno has to tip it away.