After last weekend’s 1-1 draw against Liverpool, Pochettino’s side wasted a lively performance as they paid the price for sloppy defending and wasteful finishing at the London Stadium.
Chelsea teenager Carney Chukwuemeka had scored an eye-catching first half equaliser to cancel Nayef Aguerd’s early opener for West Ham.
But the turning point came when Fernandez’s penalty was saved by Alphonse Areola just before the break.
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Antonio netted soon after the interval and Chelsea couldn’t respond despite Aguerd’s dismissal for a second booking midway through the half.
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Paqueta, reportedly the subject of an FA probe into betting breaches, applied the knockout blow in the final seconds.