Aaron Ramsey scored in stoppage time to break the resolve of Crystal Palace and give title contenders Arsenal a winning start to their league campaign.
Managerless Palace looked set for a point but had forward Jason Puncheon sent off for a second offence in the 89th minute before Ramsey pounced.
The visitors took a shock first-half lead when Brede Hangeland headed in.
The Gunners equalised just before the break when Laurent Koscielny nodded home from Alexis Sanchez's free-kick.
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