Stadium: Court 5 Round: 25 Ground: Grass
| ATP Belgrade MD | 2021/04/23 14:15 | Sabanov/Sabanov v Berrettini/Vavassori | 7-6,6-3 |
| ATP Belgrade MD | 2021/04/22 12:00 | Berrettini/Vavassori v Bambridge/Inglot | 6-4,7-6 |
| ATP Belgrade MD | 2021/04/20 11:30 | Berrettini/Vavassori v Molteni/Nielsen | 7-6,6-4 |