Nick Haycock's Development Squad beat Peterborough United 4-2 in a friendly match at Nene Park Academy on Tuesday afternoon.
After a tough start to their league campaign, the Dev Squad have been in good form recently taking four points from their last two competitive games.
Haycock fielded a mix of U21 and U18 players, such as Josh Pask, Moses Makasi and Amos Nasha, on Tuesday. U21 regulars Reece Burke and Kieran Sadlier have been called up to international duty for the England U19 and Ireland U21 squads respectively.
Ex-Peterborough striker Jaanai Gordon was in good form as he forced Posh goalkeeper Aidan Grant into a smart early save.
The Hammers continued to press for an opener and their efforts were rewarded as Sebastian Lletget put the visitors ahead.
It wasn't long before Haycock's men doubled their lead as Gordon's hard work finally paid off as he tapped in from close range.
There was just enough time for West Ham winger Matthias Fanimo, recently returned from a short loan spell at Tranmere Rovers, to score a third goal. Fanimo's tap-in put the Hammers into a commanding 3-0 lead at the break.
The hosts rallied after the break as Harry Anderson had a number of chances that went just over the bar.
The Posh's efforts were justly rewarded as Jack Friend curled a wonderful left-foot strike into the top corner after a fine pass from Tobi Adebayo-Rowling set him free.
The goal gave the hosts renewed hope as they looked for a way back into the game. Friend was on hand to score his second of the game after a defence splitting pass from the highly rated ex-Dulwich Hamlet midfielder Erhun Oztumer.
The home side continued to press for an equaliser but with time running out Fanimo scored again to wrap up the victory, with a clinical one-on-one finish.
The Dev Squad's next competitive match is against Manchester United U21s at Rush Green, on Friday 24 October 2014.
West Ham United: Spiegel, Westley, Oxford, Pask, Nasha, Mavila, Makasi, Marlow, Gordon, Fanimo, Lletget
Subs: Linley, Sheriff, Tombides