Another Arsenal debut.

Uruguay international Lucas Torreira, a £26m signing from Sampdoria, comes on for Granit Xhaka.

20 to go.

Image source, AFP

Daniel Ofili: I'm afraid the way City are going and looking at their next 6 league fixtures, it may be only 19 spots up for grabs

Giles Brooks: Arsenal: new manager - same old frailties. Can't defend for life of 'em!

Joseph Aku: This Arsenal team is far from where they need to be. Emery is going to need at least 3 seasons to get this team there. Will fans be patient enough and give him the support? There's the question

Mesut Ozil looks up and passes to the left, Alexandre Lacazette runs right.

Groans from the Arsenal supporters.

Image source, AFP

Chris Sutton
Ex-Chelsea striker on BBC Radio 5 live

Last year City blew everyone away. They were far too good, far too consistent. The start of the season is so important and they're playing in exactly the same way. Absolutely devastating. They've got so much strength in depth and it's frightening for the rest of the Premier League.

Damage limitation for Arsenal now?

Image source, Getty Images

Chris Sutton
Ex-Chelsea striker on BBC Radio 5 live

Wow. How emphatic was that. You can't keep giving this Manchester City team chances. Aguero was wasteful moments ago but Bernardo Silva absolutely not. First time, left foot, hammers it into the top corner. A wonderful finish.

Image source, Getty Images

City should have had this game wrapped up.

Debutant Matteo Guendouzi makes a shocking error, taking an air shot at a bouncing ball, allowing Sergio Aguero to run through on goal.

You would have put your mortgage on him scoring, but Petr Cech makes the save.

Manchester City have just been warned by referee Michael Oliver for taking too long from set-pieces.

Time wasting already? Bit early for that.

Mesut Ozil retired from international football in the summer, but some fans may say he retired from Arsenal a few years ago.

An hour gone and the German has had zero impact so far.

Meanwhile, Stephan Lichtsteiner and Aymeric Laporte are having a right old ding-dong in the penalty box.

Referee Michael Oliver is letting it go.

Here's the City change.

Riyad Mahrez has had a very good debut but his work is done and on comes Kevin de Bruyne.

That's what you call strength in depth.

Ellis Nordhoff: Manchester City look phenomenal. Ben Mendy is like a new signing,especially with his attacking threat. What a quality side, entertaining to watch.

Fred, Hampshire: I did not appreciate how unstressed I was during summer where I didn't have to watch arsenal try to pass it out of defence.

RegularJon: Arsenal haven’t been very good but could easily be level here. City not looking great at the back and lacked penetration since half-time

At least it's going to get easier for Arsenal...NOT.

Kevin de Bruyne is being readied to come on by City.

Chris Sutton
Ex-Chelsea striker on BBC Radio 5 live

Arsenal haven’t used the ball well enough in this game. They’ve given it away a number of times and look uncertain in possession. I have to say they are working so hard when they’ve not got the ball though. The crowd are starting to respond and Lacazette has made an instant impact.

Image source, PA

Arsenal striker Alexandre Lacazette straight into the action.

He gets a pass from partner Pierre-Emerick Aubameyang, lets it bounce on the edge of the box but strikes his shot a yard wide.

That was a good chance, it fell nicely for him, he should have made Ederson work.

Chris Sutton
Ex-Chelsea striker on BBC Radio 5 live

I really like the way Sterling has played this afternoon. He's had one thing on his mind - to commit defenders and be positive.

Image source, Reuters

Here comes the Arsenal change - an attacking one.

Midfielder Aaron Ramsey - into the final year of his contract at Emirates Stadium - makes way for Alexandre Lacazette.

Image source, Reuters

Martin: I can't believe some Arsenal fans are writing this game off like it doesn't matter. That's such a small club mentality to have.

Farouk: welcome to the day when success is bought not earned.. city with almost the leagues two best players in every position, other clubs can only pray for an Arabic takeover!

Atif: And that is why Mourinho is one of the best. Even in his first season with all the uncertainty he delivered league cup and Europa league. Lets see if Emery can do the same

Who had 53 minutes for the 'Granit Xhaka to get booked' sweepstake?

You've won.

The Switzerland midfielder gets a yellow for a late hack on Manchester City striker Sergio Aguero.