Northern Ireland were deservedly beaten by Serbia in European Under-21 Championship qualifier at Coleraine.
The group leaders dominated the first half start but the hosts came out strongly after the break and Josh Carson fired against the crossbar.
Serbia regained control and Sasa Markobic hit the bottom corner to give the visitors an 80th-minute lead.
Nemanja Gudelj sealed the win three minutes later with a penalty after James Knowles fouled Filip Duricic.
Adam Thompson squandered a late chance for Northern Ireland when he headed straight at keeper Branimir Aleksic.
The Northern Ireland line-up included Shane Ferguson - there was speculation that the Newcastle defender was tempted to switch allegiance to the Republic of Ireland earlier this year.
Steve Beaglehole's team remains on four points after five qualifiers.
Northern Ireland will be in action against Macedonia away in February before back-to-back games against Macedonia and Denmark in September.