Stadium: Court 1 Round: 44 Ground: Clay
| ITF - M15 Pirot | 2021/09/20 11:00 | Paul Valsecchi v Aleksa Mardjonovic | 4-6,6-4,6-10 |
| ITF - M15 Pirot | 2021/09/19 12:30 | Dusan Trunic v Aleksa Mardjonovic | 4-6,6-2,7-10 |
| ITF - M15 Zlatibor | 2021/09/15 13:20 | Aleksa Mardjonovic v Petar Pjevcevic | 6-1,3-6,3-6 |
| ITF - M15 Ulcinj | 2021/09/05 07:30 | Aleksa Mardjonovic v Alessandro Procopio | 7-6,4-6,6-10 |
| ITF - M15 Ulcinj | 2021/08/30 13:30 | Pietro Marino v Aleksa Mardjonovic | 6-4,7-6 |
| ITF - M15 Ulcinj | 2021/08/30 07:30 | Aleksa Mardjonovic v Obrad Markovski | 6-7,7-5,11-9 |
| ITF - M15 Novi Sad | 2021/08/03 10:10 | Aleksa Mardjonovic v Valerio Aboian | 2-6,7-5,10-12 |
| ITF - M15 Novi Sad | 2021/08/02 09:30 | Hamid Reza Nadaf v Aleksa Mardjonovic | 3-6,7-5,5-10 |
| ITF - M15 Pirot | 2021/09/20 11:00 | Samuil Konov v Kristijan Juhas | 3-6,5-7 |
| ITF - M15 Pirot | 2021/09/19 12:30 | Anthony Genov v Kristijan Juhas | 4-6,2-6 |
| ITF - M15 Zlatibor | 2021/09/13 08:00 | Kristijan Juhas v Kristof Minarik | 2-6,6-2,5-10 |
| ITF - M15 Novi Sad | 2021/08/01 12:15 | Domagoj Biljesko v Kristijan Juhas | 7-5,6-4 |
| ITF - M25 Belgrad | 2021/06/29 10:50 | Kristijan Juhas v Nick Hardt | 2-6,1-6 |
| ITF - M15 Skopje | 2021/06/07 09:30 | Plamen Milushev v Kristijan Juhas | 6-4,2-6,10-6 |
| ITF - M15 Brcko | 2021/05/19 10:25 | Luka Pavlovic v Kristijan Juhas | 6-4,6-4 |
| ITF - M15 Prijedor | 2021/05/14 08:15 | Kristijan Juhas v Gergely Madarasz | 4-6,6-7 |