Arsenal's eight-game winning streak came to an end on Sunday as Mikel Arteta's side were held to a 1-1 draw away to Southampton.
Midfielder Granit Xhaka opened the scoring on 11 minutes when he fired a half volley into the roof of the net, but Southampton levelled on 65 minutes through Stuart Armstrong.
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The result means Arsenal remain top of the Premier League, two points ahead of Manchester City, who claimed a convincing 3-1 win over Brighton on Saturday.
The visitors looked untouchable in the opening 15 minutes as they launched wave after wave of attacks on the home goal, and were rewarded with an excellent opener from Xhaka, who also netted their winner in the midweek Europa League win over PSV Eindhoven.
Bukayo Saka's flick set right-back Ben White away down the right flank and his cross was thundered into the roof of the net by Xhaka.
Southampton will have been relieved to be only 1-0 down at the break, but were much brighter in the second period and were deserving of their equaliser, perhaps profiting from an Arsenal side who looked increasingly weary from their midweek exertions.
A quick counter-attack on 65 minutes drew reward when Mohamed Elyounoussi slipped the ball into the path of Armstrong, who was composed with his finish past goalkeeper Aaron Ramsdale.