Dawson heads West Brom opener from Chadli corner
Sanchez equalises with 22nd goal of season
Sub Robson-Kanu restores Baggies' lead a minute after coming on
Dawson scores his second with another header
Cech taken off injured, replaced by Ospina
West Brom 2-1 Arsenal
Kevin Kilbane
Former Republic of Ireland winger on 5 live
Lovely breakaway - the pace of Hal Robson Kanu was outstanding.
David Ospina should have been more alive to that threat in my opinion.
Great break there though - that is a threat West Brom do have.
West Brom 2-1 Arsenal
So nearly 3-1! Hal Robson-Kanu's run is perfect but his chipped shot from an angle is saved by Ospina. Nacer Chadli follows up, but his effort is blocked by a defender near the line before Chris Brunt fires over from range.
Image source, Getty ImagesWest Brom 2-1 Arsenal
Kevin Kilbane
Former Republic of Ireland winger on 5 live
There's been no impact on the game today from Theo Walcott. Might be something to do with the fact James McClean has worked hard to neutralise him all match.
Image source, AFPWest Brom 2-1 Arsenal
So nearly 2-2. The corner is swung in and met by Danny Welbeck, whose header slams flush against the bar.
Image source, Getty ImagesWest Brom 2-1 Arsenal
Arsene Wenger identifies the need for change. Off goes Theo Walcott, who has done almost nothing, and on comes Olivier Giroud. This taking place as Arsenal wait to take a corner...
Image source, Getty ImagesWest Brom 2-1 Arsenal
Kevin Kilbane
Former Republic of Ireland winger on 5 live
I think Wenger needs to make a decision now about who he brings on.
They need a spark. They haven't had one on the ball all game.
Welbeck has been working hard but just hasn't been able to get into the game.
West Brom 2-1 Arsenal
My mistake, it wasn't Robson-Kanu's first touch. It was his second. 50% less efficient than I thought.
West Brom 2-1 Arsenal
Arsenal look to respond quickly again but Shkodran Mustafi's cross lands on the roof of the net.
Just seen replays of the goal. James McClean wasn't offside from the first chipped ball and there was no foul on Hector Bellerin in the middle of the box. Perfectly good goal. Not from an Arsenal point of view, obviously.
Image source, APWest Brom 2-1 Arsenal
Kevin Kilbane
Former Republic of Ireland winger on 5 live
A good decision from the referee Neil Swarbrick.
It was very, very, very tight - he was maybe just offside but certainly not interfering.
Image source, Getty Images
West Brom 2-1 Arsenal
What an impact! Hal Robson-Kanu's first touch is to tap the ball into the net - a goal that had been abandoned by David Ospina. The Gunners' sub keeper comes out to try and slide the ball away after a chipped ball into the box but succeeds only in finding Robson-Kanu, who slides the ball under him and home.
The Arsenal players are protesting (for a foul? offside against a Baggies player, who allowed the ball to roll between his legs and in?) but after a brief chat with his assistant Neil Swarbrick gives it.
Hal Robson-Kanu
Image source, Getty ImagesWest Brom 1-1 Arsenal
Rondon's misplaced header is his last act. Off he goes to be replaced by serial substitute Hal Robson-Kanu. Rondon heads straight down the tunnel. Doesn't look happy.
West Brom 1-1 Arsenal
Arsenal win another corner. This time Xhaka swings the ball in but it is headed away initially at the near post before an offside flag ends any hope of a follow-up attack.
West Brom 1-1 Arsenal
Kevin Kilbane
Former Republic of Ireland winger on 5 live
We spoke about Brunt in the first half - he gives everything the strikers want from a delivery.
Big chance there for West Brom.
West Brom 1-1 Arsenal
Great cross! Shame about the header. Chris Brunt gets the ball out of his feet on the left before swinging in a pinpoint cross from Salomon Rondon. The striker rises above his marker to meet it but glances his header wide.
West Brom 1-1 Arsenal
Arsenal win a corner. They take it short and feed the ball to Sanchez but his cross is headed away by a home head.
West Brom 1-1 Arsenal
Arsenal start on the front foot but a rare lack of control from Alexis Sanchez in the box sees the ball find a West Brom defender, who clears.
West Brom 1-1 Arsenal
We are back under way.
Who should stay and who should go at Arsenal this summer? Final Score presenter Jason Mohammad discusses that and today's action with guests Dion Dublin and Sue Smith via Facebook Live.
West Brom 1-1 Arsenal
Kevin Kilbane
Former Republic of Ireland winger on 5 live
A good watch so far. It has been very open and very attacking.
West Brom have been able to get back into shape easily after each attacking threat from Arsenal and we've had two good goals from each side.
By and large, the Arsenal bench doesn't have someone who will bring any technical change - perhaps one or two goals could come from Olivier Giroud if he were to come on to replace Sanchez.
Image source, PA