Alexis Sanchez heads in the first goal and pokes in the fourth
Defoe levels from the penalty spot
Substitute Giroud comes on to score twice
Sunderland 0-1 Arsenal
Whabi Khazri's foul on Mesut Ozil earned the Sunderland man a booking, and Khazri is soon joined in the referee's notebook by team-mate Didier Ndong.
It is all Arsenal at the moment, with Sunderland struggling to cope.
Image source, Getty ImagesSunderland 0-1 Arsenal
Alexis Sanchez steps up.. and sends the free-kick over the top. A let-off for the hosts.
Sudnerland 0-1 Arsenal
More danger for Sunderland. Wahbi Khazri clumsily brings down Mesut Ozil on the edge of the penalty area. Alexis Sanchez to take the free-kick.
Sunderland 0-1 Arsenal
Pat Nevin
Ex-Chelsea winger on BBC Radio 5 live
Van Aanholt didn't know that Sanchez was behind him - I'm struggling to understand how he didn't know though because there was 30,000 people telling him as much.
Sunderland 0-1 Arsenal
Patrick van Aanholt is 30 yards from the Arsenal goal but dithers on the ball, losing possession with the visitors breaking at a frightening pace.
The counter-attack move ends with the Alex Iwobi having a chance, and he powerfully curls an effort at goal, but it nips just over the crossbar. So nearly 2-0 to the Arsenal.
Sunderland 0-1 Arsenal
Liam: Get in! Dangerous pass & killer finish from Alexis. Defenders were like statues
Joseph Gilliland: The delivery from Ox was exquisite! Tidy little header from Sanchez to make it 1-0
Elsie Milkowski: Alexis Sanchez is a good reason to wake up early on a Saturday. GOAL!
Sunderland 0-1 Arsenal
Pat Nevin
Ex-Chelsea winger on BBC Radio 5 live
It's fitting that Sanchez got the goal, I think he's been the best player on the pitch so far.
He isn't actually playing as a number nine, he's dropping back and playing as a number ten at times as well. He's an absolute nightmare for the central defenders right now.
Image source, PASunderland 0-1 Arsenal
Sunderland have only just gone behind but have a quick chance to get things back level. Patrick van Aanholt gets a free-kick from 25 yards out and curls it over the wall, but it goes just wide of the post.
Sunderland 0-1 Arsenal
That Arsenal goal by the way came at the end of a 22-pass move from the Gunners. A brilliant-worked goal, skillfully executed by Sanchez. Definitely one to make sure you see on Match of the Day later on.
Image source, PASunderland 0-1 Arsenal
Pat Nevin
Ex-Chelsea winger on BBC Radio 5 live
It has been coming without a shadow of a doubt.
Bellerin's understanding down that right side is unbelievable.
Sanchez is four inches smaller than Kone who is supposedly marking him - Arsenal fans will be saying "who needs Olivier Giroud?"
That is a fantastic header.
Image source, Reuters
Alexis Sanchez (19 mins)
A lovely move from Arsenal and a lovely diving header from Alexis Sanchez puts the Gunners ahead.
Alex Oxlade-Chamberlain skins his marker Duncan Watmore on the right-hand side and his excellent cross finds Sanchez, who gets in front of Lamine Kone and flings himself towards the ball.
The diving header is perfect and he buries it from eight yards out past Jordan Pickford.
Image source, Getty ImagesSunderland 0-0 Arsenal
Remember, we have live coverage of this match on BBC Radio 5 live right now. Listen along by pressing the play button at the top of the page.
Image source, BBC Radio 5 liveA culture clash. Jonathan Overend, Mark Lawrenson and Ian Dennis look ahead to West Brom v Man City.
Sunderland 0-0 Arsenal
Pat Nevin
Ex-Chelsea winger on BBC Radio 5 live
The pass from Sanchez, from up here, may look easy. But to pick that out with so many defenders around, that's a pass that even Santi Cazorla would be happy with, and that's high praise indeed.
That's the moment of the match so far.
Sunderland 0-0 Arsenal
Sunderland are sliced open far too easily, and only a weak finish from Mesut Ozil lets them off the hook.
Hector Bellerin is causing problems on the right side and he finds Alexis Sanchez, who in turns releases Mesut Ozil and he is free on the top right-hand side of the penalty area.
But Ozil opts for precision instead of power and the side-footed effort is well held by Jordan Pickford.
Image source, AFP/Getty ImagesSunderland 0-0 Arsenal
Stu Richards: On paper this should be a routine three points for the Gooners but hideous away strips seldom prosper in the beautiful game.
Solid logic from Stu there. Get your money on Sunderland, punters.
Sunderland 0-0 Arsenal
A whipped in corner from the left wing from Mohamed Elneny causing panic in the home defence, who scramble it away for another corner.
Mesut Ozil floats in a set-piece in from the other side, but it is too close to Jordan Pickford who gathers easily.
Sunderland 0-0 Arsenal
Pat Nevin
Ex-Chelsea winger on BBC Radio 5 live
Some strong defending from John O'Shea.
Obviously John O'Shea is terrified of Alexis Sanchez getting behind the defence and turning it into a foot race.
I have no idea how that wasn't given as a foul, that was a rugby challenge.
Image source, ReutersSunderland 0-0 Arsenal
A half chance for Sunderland as Billy Jones, overlapping from right-back position, gets a cross in from the dead-ball line, but Petr Cech is a commanding presence in the Gunners goal and gathers well to end the danger.
Sunderland 0-0 Arsenal
Alex Oxlade-Chamberlain got two goals in the 2-0 midweek EFL Cup win over Reading and nearly gets a goal inside the first five minutes.
Hector Bellerin's deep cross finds Oxlade-Chamberlain, who manages to get in a header in between two Sunderland defenders. The ball is looping in until Jordan Pickford pushes it out for a corner, which comes to nothing.
Image source, Getty Images