Pat Nevin
BBC Radio 5 live

Image source, Getty Images

"Anywhere else on the field, that challenge by Gabriel was a free-kick. He just shoved him off the pitch! That was very dangerous indeed, especially as it was inside the penalty box. 

"Hazard did have some of Gabriel's shirt though, so maybe from the referee's point of view he thought it was six of one and half a dozen of the other."

You can listen to live commentary of this fixture via the Live Coverage tab at the top of this page.

And here's a penalty appeal too, well sort of. Gabriel muscles Eden Hazard off the ball to stop him wriggling past him by the left-hand by-line. Chelsea want a spot-kick, but referee Mike Dean is having none of it.

Hang on though because here's a chance - well, half of one anyway. Pedro gets behind Santi Cazorla as he darts on to a Cesc Fabregas long ball but Petr Cech is off his line before he can get a meaningful shot away.

No goals or clear chances and precious few shots, but we do have our first booking: Mike Dean puts Santi Cazorla's name in his book after he trips Pedro on the half-way line to prevent him breaking forward.

The sting has gone out of this game a bit. Arsenal are in the ascendancy at the moment, possession-wise, but they are hardly knocking on the door.

Arsenal have been a bit quiet coming forward of late, but Theo Walcott is involved again here. Chelsea only half clear a Santi Cazorla free-kick and Walcott finds space on the left of the area, but his attempt to side-foot it into the opposite corner of the net in the style of Thierry Henry is not accurate enough to beat Asmir Begovic.

This is another good spell of possession by Chelsea, who win a corner out on the left. Petr Cech comes to get it... and misses it... but the ball flies straight out of play. Lucky boy. Hmmm, maybe you do beat Cech from there?

Image source, Getty Images

Chelsea manage their second shot of the game, this time a skidding effort from Diego Costa. Again it is from a long way out, though, and as most of the Stamford Bridge crowd will know - you do not beat Petr Cech from there.

Francis Coquelin briefly leaves the pitch but jogs back on moments later, and seems fine. Mikel Arteta was warming up just in case - which probably did not fill Arsenal fans with too much confidence.

A worry for Arsenal boss Arsene Wenger because his key (or only?) defensive midfielder Francis Coquelin is down and receiving treatment in the centre-circle. The Gunners did not cope very well without him in Croatia on Wednesday, did they?

Chelsea threaten again, as Diego Costa wins the ball back down the left and bundles his way into the area. His attempt to find a team-mate with a pull-back fails, however, and it is safe to say that an end product is eluding both teams at the moment.

Pat Nevin
BBC Radio 5 live

"Some great interplay from Chelsea and the fans increase the volume. They've just seen their side play a style of football which they haven't produced since last season."

You can listen to live commentary of this fixture via the Live Coverage tab at the top of this page.

This time it is the Gunners' defence that does well. Some neat stuff by Chelsea in and around the Arsenal area but Gabriel is in the right place to break up the visitors' attack.

I wonder how many times Theo Walcott will be caught offside today? The flag has gone up on him again, and again it was very close. Chelsea are living a bit dangerously in terms of the margins of these calls but, so far, their defence is looking well organised. 

No doubt John Terry, looking on from the bench, will be impressed.

Phil McNulty
BBC Sport chief football writer

Oscar has been on the receiving end of plenty of touchline approval from Chelsea manager Jose Mourinho in these early stages. Two robust midfield challenges prompt a flurry of "thumbs up" gestures from Mourinho to the Brazilian.

Luca Goodman: Who'd have thought a few years ago that Fabregas would be taking a shot at goal for Chelsea with Petr Cech in goal for Arsenal

Bright Eugene:  One thing is certain. Arsenal will outpace Chelsea today. But can they outgun them? Time will tell.

A first sniff for Chelsea striker Diego Costa, who is crowded out on the edge of the area after good work by Oscar, who is having an impressive game all round so far.

Pat Nevin
BBC Radio 5 live

Image source, Reuters

"It was frantic to begin with but now this game has settled into what we expected. And you have to say, Arsenal look the more comfortable side when they're on the ball. But only just.

"Walcott is looking really lively - playing on the shoulders of the defenders and trying to use his pace at every opportunity. I completely understand why he prefers to play as a centre-forward rather than wide on the right, because he's always involved."

Arsenal striker Theo Walcott times his run slightly wrong on this occasion, and is flagged offside as he charges on to another lofted pass. He went too early, but only just.

Some good defending from both sides so far, which is why that tame Cesc Fabregas effort from earlier remains the only shot at goal of the game. Gary Cahill is the latest player to put in a sliding tackle that was timed to perfection, this time on Alexis Sanchez. Oscar has made a couple of brilliant challenges too.