Ricardo Vaz Te scored a late winner as West Ham survived an unlikely comeback to beat Cardiff 3-2 in the Capital One Cup.
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The Hammers were two up and cruising with seven minutes gone thanks to goals from Ravel Morrison - after just 20 seconds - and Matt Jarvis.
City had made 11 changes to their line-up from the team narrowly beaten by Tottenham on Sunday, and they played like strangers as West Ham threatened to run riot in the first half.
Modibo Maiga, Vaz Te and James Collins should all have put the game to bed before the interval.
But somehow the score stayed the same until the stroke of half-time when Craig Noone halved the deficit with Cardiff's first attack of the match.
And midway through the second half they found an equaliser when Peter Odemwingie scored on his full debut for the club.
But three minutes from time Vaz Te converted a cross from Jack Collison and ensured it was the Hammers who made it through to the fourth round.