Arsene Wenger’s side made light work of under-performing Hammers.
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Arsenal were dominant from the off and West Ham were perhaps fortunate to not concede an early penalty with James Collins appearing to take down Theo Walcott in the box.
On the stroke of half-time Olivier Giroud finished off a superb team move to give the home side the lead.
On 81 minutes Aaron Ramsey combined well with Giroud before netting Arsenal’s second, with West Ham’s back-line clearly starting to creak.
Barely two minutes later Mathieu Flamini, on as sub, calmly slotted home from close range to kill off West Ham.