A late goal from Fabio Quagliarella condemned West Ham to a 1-0 defeat in their Bobby Moore Cup clash against Napoli.
A keenly-contested encounter at Upton Park ultimately went the way of the Italians after Quagliarella looped home a superb flicked header over Hammers goalkeeper Robert Green after 78 minutes.
The visitors were on the back foot moments later, however, when Manuele Blasi was sent off for a second yellow card just 26 minutes after entering the fray as a substitute.
The hosts pushed for an equaliser in the final minutes and came close through Junior Stanislas in stoppage time, but Napoli's 10 men held on for the win.