Fulham’s Aleksandar Mitrovic scored twice as Serbia beat neighbours Montenegro in a historic first meeting between the former Yugoslav republics.
The two nations, who competed as one at the 2006 World Cup finals, became independent nations later that year.
Although played under tight security, the Nations League third-tier match had a friendly atmosphere.
Mitrovic fired in an 18th-minute penalty and, after Serbia wasted more chances, stroked in a late second.
Manchester United manager Jose Mourinho was watching the League C Group 4 from the stands, following recent reports claiming he is keen on signing Serbia centre-back Nikola Milenkovic from Italian side Fiorentina.