Darren Bent's ninth goal of the season condemned Arsenal to a first defeat in 14 attempts as Sunderland claimed another big scalp with a 1-0 win.
The England international stabbed home from close range with 71 minutes gone to seal a famous victory in a tight encounter at the Stadium of Light.
Black Cats keeper Marton Fulop had earlier made a fine save to deny Tomas Rosicky, but the Gunners failed to make the most of the possession they enjoyed and ultimately paid for it.
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