Champions and leaders Red Star Belgrade suffered home defeat by Bezanija in the Serbian football championship.
The result left Red Star on 51 points from 23 matches in the six-team championship play-off, while second-placed city rivals Partizan have 45 after beating Hajduk Kula.
Red Star will face Partizan in their "eternal derby" on Wednesday.
Playoffs, Week 23 - RESULTS
Red Star - Bezanija 1-3
Partizan - Hajduk 2-0
Vojvodina - Mladost 4-1
Playout, Week 23 - RESULTS
OFK Beograd - Zemun 2-0
Banat - Vozdovac 0-1
Smederevo - Borac 1-0