Arsenal unbeaten streak was thwarted by Southampton as they secured a 3-2 win over the Gunners at the Saint Mary's stadium in the English Premier League.
Charlie Austin's 85th-minute header clinched victory for Southampton manager Ralph Hasenhuttl on his home debut and ended Arsenal's 22-match unbeaten run.
In a see-sawing encounter, the hosts took the lead after 20 minutes through Danny Ings but
Henrikh Mkhitaryan nodded in shortly to restore parity. Nathan Redmond floated a cross for Ings who cushioned a looping effort into the far corner.
Arsenal turned the screw in the second half and restored parity as Mkhitaryan's shot deflected in off Jannik Vestergaard.
The Gunners had their chances with Alex McCarthy impressing in the home goal, but Southampton were dangerous on the break and Shane Long had a goal rightly ruled offside before providing a teasing cross for Austin's winner.
The victory takes Southampton out of the relegation zone and up to 17th.