The referee blows for full-time and that gives Arsenal a much-needed win. Tough to take for West Brom though.

Image source, Reuters

There will be four minutes of added time.

Hector Bellerin heads high from a Lucas Perez cross and, after keeper Ben Foster takes his time in taking the goal-kick, Neil Swarbrick gives him a yellow card.

Image source, Reuters

Arsenal substitute Lucas Perez sends a low ball across the West Brom box for Olivier Giroud and Mesut Ozil but neither player can get a touch to turn the ball home.  

A let-off for Arsenal. A West Brom corner is dropped by keeper Petr Cech and falls to Claudio Yacob at the far post but he can only sky a shot from close range.

Image source, Getty Images

Arsenal have had nearly 80% possession, 16 attempts on goal, but still there's no way past Ben Foster in the West Brom goal.

Image source, Opta

Arsenal's Kieran Gibbs comes off worst after a tackle on Claudio Yacob and the Gunners left-back is booked to compound his misery.

James McClean comes on for Nacer Chadli, who gets booed as he makes his exit courtesy of him having had a stint at Tottenham. 

Arsenal will be having nightmares about Ben Foster if this continues. This time the West Brom keeper sticks out a leg to keep out an angled Olivier Giroud shot and it's still level.

Ben Foster is proving a one-man roadblock to Arsenal scoring. The Baggies keeper tips over a powerful Alexis Sanchez 18-yarder before comfortably gathering an Olivier Giroud header which is straight at him.

Image source, Reuters

Those Arsenal chances have woken up the home crowd. About time.

It's suddenly all-action. From a corner, the ball falls at the feet of Alexis Sanchez in the six-yard box and he dodges a number of defenders before seeing his shot hit the post.

Image source, Reuters

West Brom keeper Ben Foster keeps it level with a double saves. Firstly, he parries an Alex Iwobi shot and then saves at the feet of Alexis Sanchez as the Chile international tries to put in the rebound.

Image source, Reuters

The second half is under way. Let's hope it's better than the first!!

Ahmed Ashour: It is not about possession but what yo do with. Sorry it out Arsenal before we are made of laughing stock AGAIN!

Gooner72: Arsenal's performance today suggests that the players attitudes towards the fans mirrors the managers - no fight at all...

West Brom may be camped in their own half but they've still had one shot on target in the first half - the same as Arsenal.

Image source, .

Nick Clohessy: West Brom, with all the adventure of plain toast made in a toaster that takes 20 seconds too long every single time.

Scotty: Slow, boring and predicatable. Same old really. #Arsenal

Arsenal have had plenty of possession but just can't find a way through a very organised and disciplined Baggies defence.

Image source, Getty Images

Tony Husband
BBC South Today sports editor

It's very interesting to see how well Tony Pulis' side are set up here. 

They are so well organised and all of the West Brom players are working incredibly hard to keep this shape. 

Image source, AP