Arsenal saw their eight-game winning run in all competitions come to an end as they were held to a frustrating 1-1 draw at struggling Southampton.
The points extends the Gunners' lead at the top of the Premier League table to two points over Manchester City, but Mikel Arteta will know his side threw away the chance of a ninth successive victory.
It looked like they would be cruising to another win when Granit Xhaka swept in a stunning half-volley after just 11 minutes to open the scoring.
But the visitors wasted several chances to extend their lead, with Gabriel Jesus the main culprit, and the misses were to prove costly in the second half.
Arsenal were sloppy after the interval, just as they were at Leeds last weekend, and this time they were punished when Mohamed Elyounoussi played in Stuart Armstrong to equalise.