Arsenal's first win at City since 2010
Man City five points adrift of Chelsea
Win takes Arsenal up to fifth
West Ham beat Hull 3-0 in early game
Can Manchester City find a way through before the break? It doesn't look likely so far. James Milner gets the ball on the left and is tackled, but then Aaron Ramsey tries to dribble it out of his own six-yard box! He does too - but that must make Arsenal fans nervous...
Former Scotland international Pat Nevin
BBC Radio 5 live at Etihad Stadium
"Arsene Wenger's tactics have been brilliant so far. They have worked, and Arsenal got the break with the goal, but Wenger is still not happy. He would expect his players to keep the ball a lot better than they have been, because if you continue to give the ball away to City they will create chances. City do look a bit sluggish in possession though."
City have plenty of the ball but twice Jesus Navas fails to deliver the cross when well placed. Perhaps if he had Edin Dzeko or Wilfried Bony to aim at he would have swung it over? As it is Arsenal look exceedingly comfortable. They are sitting deep and parking the yellow and blue bus. Vincent Kompany, having a somewhat ragged return to action, is booked for a shove on Olivier Giroud.
Sergio Aguero finally gets the chance to run at Per Mertesacker but he fluffs his touch and the ball gets away from him. After a month out the Argentine is obviously not match sharp.
Aaron Ramsey is booked for a trip in midfield.
Image source, AFP/GETTYSergio Aguero has had five touches of the ball so far - two fewer than Joe Hart. That tells you everything about City's attacking force so far.
A colleague rightly points out that without Yaya Toure or Frank Lampard in midfield their range of passing looks limited. Do you need Fernando AND Fernandinho in the same team, at home?
Like playing Nicky Butt with David Batty.
Image source, PAFormer Scotland international Pat Nevin
BBC Radio 5 live at Etihad Stadium
"How many times have we mentioned Sergio Aguero? All the questions are being asked of Manuel Pellegrini. Are you going to adapt it now? Or wait until half-time? City have got real quality on the pitch. But they are not getting a touch because of the way Arsenal are playing. Most managers will leave any changes until half-time, but it is quite dangerous to do that."
Something for the Sunday League player in us all as Per Mertesacker lumps a 60-yard clearance out of play, full on the volley.
"AWAAAYYY!"
Manchester City look rather stumped by Arsenal's defending so far. It's made for Frank Lampard and his late runs.
Gareth Whalley: This is a really mature start by Arsenal. Keeping the deep banks of four and keeping David Silva out of the game. Very impressive.
Liam Smith: Clumsy from Vincent Kompany. Very mature performance from Arsenal so far, is Arsene Wenger finally getting it right?
Keval Shah: This game reminds me of X-Men III when the army starts using plastic guns against Magneto. This is that moment for Arsene Wenger.
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Arsenal's penalty was only the second foul Manchester City had conceded in the game. It was crucial though.
City fans sound frustrated as another lengthy spell of passing goes nowhere. Per Mertesacker steps out well to cut out a through ball and Arsenal have it back.
City put six past Arsenal in this fixture last season but Arsene Wenger's side look a different proposition so far today. David Ospina in the Gunners goal hasn't had to lay a glove on the ball in the opening 27 minutes.
Bright Eugene: A stonewall penalty there. Just while I was typing that Vincent Kompany can be quite clumsy when he is in the mood. A silly challenge.
Cameron Laws: That's a dive, but lazy defending from Kompany throwing himself at the player.
Tokunbi: Arsenal lead? Wow.
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Before this game all of the BBC Sport pundits were crying out for Arsenal to change their approach away from home against another 'big' team. The call was for the Gunners to be better drilled, more defensive, and look to hit on the break. They've done that today, and now they lead. Can they shut out City?
Image source, EPAFormer Scotland international Pat Nevin
BBC Radio 5 live at Etihad Stadium
"Arsene Wenger can be once again seen as a tactical genius - his team has hardly touched the ball but a couple of times in the last 10 minutes they have broken well. That one was all down to the referee's decision though. Vincent Kompany could not believe the penalty was given. He thinks he was just being strong. His arm was out for me, but boy did Nacho Monreal go down easily."
Santi Cazorla goes to Joe Hart's left - and the England keeper is very close to getting to it. He can't though and Arsenal lead.
Image source, PANacho Monreal plays a one-two, runs into Vincent Kompany and it's a penalty! Ref Mike Dean is convinced.
After City survive that Arsenal scare they look to craft a chance of their own. David Silva ghosts into the area for the first time and is found by Fernando, but Silva's cute header back across goal is well cut out before it can find the waiting Sergio Aguero.
Alexis Sanchez picks the ball up in a central position for the first time and instantly beats a man to get into the area. Vincent Kompany slams the door in his face but moments later the Gunners have the first chance.
Alex Oxlade-Chamberlain gets clear on the right, looks up and picks out Olivier Giroud at the near post and his header is deflected wide by the leg of Kompany. Great defending.
Joe Hart looks a bit shaky from the corner but just about punches it away.
Arsenal have had just 21% of the possession so far. They are well drilled though, moving as a unit across midfield and not allowing any space in behind. Most of City's play has been in their own half.
Image source, Getty ImagesFormer Scotland international Pat Nevin
BBC Radio 5 live at Etihad Stadium
"There have been a couple of little hopeful moments from Arsenal already. Manchester City have been defending well, playing as a tight line when they haven't got the ball, but I suspect there will be chances for the away side. Arsene Wenger will be happy with what he has seen so far."
David Silva is now over on the left for Manchester City - he does what he wants. A modern day Chris Waddle.
It's been a bit - can I say dull? - dull so far.
Image source, Getty Images