Costa brings Arsenal to their knees as Chelsea stun Gunners

Mertesacker sent off and Spanish striker maintains the Blues' incredible record to heap misery on Arsene Wenger

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(Image credit: Clive Mason/Getty Images)

Arsenal 0 Chelsea 1.

A goal for Diego Costa and a red card for Per Mertesacker settled Sunday's London derby and prolonged Arsenal's extraordinary and miserable record against Chelsea. It's now nine Premier League clashes without a win for the Gunners, whose last victory over the Blues was a 5-3 victory in October 2011.

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