Match ends, Newcastle United 0, Arsenal 1.
An own goal from defender Fabricio Coloccini gave Arsenal an unconvincing victory over 10-man Newcastle.
Arsenal scored early in the second half when winger Alex Oxlade-Chamberlain's angled shot on the rebound clipped Coloccini's heel and went into the net.
The hosts had earlier seen striker Aleksandar Mitrovic sent off in the 16th minute for a rash challenge on Gunners midfielder Francis Coquelin.
Newcastle failed to register a single shot on target in the entire contest.
Arsenal have not lost at St James' Park in the league since December 2005 and have won their last eight games against Newcastle, scoring 21 goals and conceding just six.
Newcastle boss Steve McClaren has still to to taste victory in the Premier League after four matches at his new club.
Arsenal's lack of goals still a concern
Arsenal manager Arsene Wenger described his side's start to the season as "very average" before this game and although the Gunners secured three points at St James' Park their strikers continue to misfire.
After Mitrovic's 16th-minute dismissal, Arsenal dominated possession in the final third of the pitch but were unable to turn that superiority into goals.
Theo Walcott's best effort was to lift a chance he should have scored over the crossbar while substitute Olivier Giroud made little impact when he came on.
With the transfer window set to close on Tuesday, Arsenal's supporters will be hoping Wenger has a goalscorer lined up from somewhere.
McClaren must control Mitrovic
Newcastle signed Mitrovic from Anderlecht for £13m in the summer and the Serbia international arrived with a reputation as a volatile player.
McClaren had already said that the 20-year-old must show more "emotional control" after yellow cards in his first two Premier League games.
After Mitrovic's senseless high tackle on Coquelin, the former England manager's words will need to be much tougher than that.
McClaren felt the sending off was "harsh" and "clumsy" but he cannot afford to be playing matches with 10 men and at the moment Mitrovic looks like a red card waiting to happen.
Are the Gunners title challengers?
This is supposed to be the season that Arsenal graduate from top-four regulars to title contenders.
At the moment it's hard to build a compelling case that they will rival teams like Manchester City, although it is still very early days.
Wenger was pleased with the way in which his side "kept our nerve" and described their display as "mature and intelligent".
It's an old cliche that champions have to win ugly but if Arsenal have serious ambitions on the top prize they should be breezing past a 10-man Newcastle side.
Man of the match - Alex Oxlade-Chamberlain
Newcastle boss Steve McClaren told BT Sport: "All we could do is show spirit and fight and they were magnificent. What a crowd as well. It was a harsh red card. It was more clumsy and he stood on his foot. I just felt early on there were too many yellows and it was a rod for the referee's back."
Arsenal manager Arsene Wenger told BT Sport: "We were always on top. We were mature and intelligent and the win was important so maybe we were a bit cautious. They toughened the game up, they decided from the start to make it very physical but we kept our nerve."
The stats you need to know
- Arsene Wenger has won 10 out of his 11 matches against Steve McClaren
- Newcastle have been shown nine red cards since the start of last season, more than any other Premier League side
- Arsenal are unbeaten in their last 10 Premier League matches against Newcastle
- Newcastle have not had a shot on target since the first half of their match against Swansea on 15 August
'Arsenal are going to struggle this season'
BBC Radio 5 live's Danny Mills: "On the balance of play, Arsenal have probably deserved to win. It's three points, and the style of this performance will be forgotten about if Arsenal continue to improve. But do they have the out-and-out cutting edge to challenge for the title? I think Arsenal are going to struggle this season."
- 18MbembaBooked at 19mins
- 2ColocciniBooked at 90mins
- 8AnitaBooked at 48minsSubstituted forPérezat 72'minutes
- 7SissokoBooked at 3minsSubstituted forCisséat 78'minutes
- 5WijnaldumBooked at 49mins
- 20ThauvinBooked at 26minsSubstituted forde Jongat 87'minutes
- 45MitrovicBooked at 16mins
- 10de Jong
- 19CazorlaBooked at 49mins
- 15Oxlade-ChamberlainSubstituted forArtetaat 81'minutes
- 14WalcottSubstituted forGiroudat 70'minutes
- Andre Marriner
- Shots on Target
Second Half ends, Newcastle United 0, Arsenal 1.
Attempt saved. Olivier Giroud (Arsenal) left footed shot from the centre of the box is saved in the top centre of the goal. Assisted by Aaron Ramsey with a through ball.
Corner, Arsenal. Conceded by Massadio Haidara.
Fabricio Coloccini (Newcastle United) is shown the yellow card.
Alexis Sánchez (Arsenal) wins a free kick on the left wing.
Foul by Jack Colback (Newcastle United).
Attempt saved. Nacho Monreal (Arsenal) left footed shot from the left side of the box is saved in the centre of the goal. Assisted by Santiago Cazorla with a cross.
Corner, Arsenal. Conceded by Daryl Janmaat.
Attempt blocked. Alexis Sánchez (Arsenal) right footed shot from outside the box is blocked. Assisted by Aaron Ramsey.
Attempt saved. Santiago Cazorla (Arsenal) right footed shot from outside the box is saved in the bottom left corner.
Substitution, Newcastle United. Siem de Jong replaces Florian Thauvin.
Francis Coquelin (Arsenal) wins a free kick in the attacking half.
Foul by Jack Colback (Newcastle United).
Foul by Héctor Bellerín (Arsenal).
Georginio Wijnaldum (Newcastle United) wins a free kick in the defensive half.
Corner, Arsenal. Conceded by Tim Krul.
Substitution, Arsenal. Mikel Arteta replaces Alex Oxlade-Chamberlain.
Foul by Alexis Sánchez (Arsenal).
Florian Thauvin (Newcastle United) wins a free kick in the attacking half.