A pitiful show at the Emirates Stadium saw West Bromwich Albion secure the shock result of the season so far.
The visitor’s first-half domination merited a goal, but they squandered a spot-kick chance before the break.
Arsenal still failed to escape an embarrassment as the Baggies took an astonishing 3-0 lead after the break.
And it could have been worse for the hosts had sole performer Samir Nasri not fired in two goals to salvage a lifeline late on.
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