Arsenal Under-18s succumbed to their first defeat of the year with a 1-0 reverse at the hands of West Ham on Saturday morning.
Jack Powell's second-half strike was enough to seal all three points for the hosts, who also saw a penalty saved in the first half.
Steve Bould's young Gunners had opportunities of their own to score but could not convert against their east-London rivals at Little Heath.
The defeat sees the Under-18s drop to third in the Premier Academy League table, a point behind leaders Fulham with a home fixture against Ipswich Town awaiting on Friday at London Colney.
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