The Gunners are on 18 points from the opening seven matches of the season with defending champions Manchester City a point behind and North London rivals Tottenham Hotspur also on 17 points.
As it happened: Brentford vs ArsenalWilliam Saliba headed the visitors in front in the 17th minute, rising to angle a corner from Bukayo Saka in off the far post.
Another header, 11 minutes later, doubled Arsenal's advantage with Grant Xhaka picking out Gabriel Jesus with a perfectly floated cross from the left which the Brazilian met powerfully.
The game was put beyond Brentford in the fourth minute after the break thanks to a wonderful strike from outside the box by Portuguese midfielder Fabio Vieira, which rattled in off the post.
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