Stadium: COURT VIKTOR TROICKI Round: 25 Ground: Clay
| ITF M15 Kursumlijska Banja | 2023/08/29 11:10 | Stefan Kostic v Romeo Hadzimehmedovic | 4-6,6-4,1-6 |
| ITF M15 Sarajevo | 2023/06/07 07:00 | Luka Mikrut v Stefan Kostic | 6-2,6-1 |
| ITF M25 Kiseljak | 2023/05/30 10:55 | Nicolas Zanellato v Stefan Kostic | 6-1,6-1 |
| ITF M15 Brčko | 2023/05/23 10:00 | Stefan Kostic v Alexandre Aubriot | 0-6,1-6 |
| ITF M15 Prijedor | 2023/05/19 07:00 | Tim Ruehl v Stefan Kostic | 6-1,6-1 |
| ITF M15 Doboj | 2023/05/10 08:00 | Kirill Mishkin v Stefan Kostic | 6-2,1-6,6-1 |
| ITF M15 Zlatibor | 2022/09/11 09:45 | Stefan Kostic v Milos Vukovic | 0-6,3-6 |
| Challenger - Savannah | 2024/04/21 14:00 | Federico Agustin Gomez v Alexander Frusina | 6-4,6-4 |
| Challenger Tallahassee | 2024/04/14 16:20 | Alexander Frusina v Gerald Melzer | 2-6,4-6 |
| Challenger Sarasota | 2024/04/07 17:25 | Alexander Frusina v Gabi Adrian Boitan | 3-6,4-6 |
| ITF M15 Heráklion | 2024/03/21 10:10 | Alexander Frusina v Edas Butvilas | 4-6,4-6 |
| ITF M15 Heráklion | 2024/03/19 12:45 | Joseph Phillips v Alexander Frusina | 3-6,3-6 |
| ITF M15 Heráklion | 2024/03/12 10:30 | Ofek Shimanov v Alexander Frusina | 7-6,6-4 |
| ITF M15 Heráklion | 2024/03/07 11:00 | Alexander Frusina v Alexandros Skorilas | 6-7,3-6 |
| ITF M15 Heráklion | 2024/03/06 09:30 | Samuel Puskar v Alexander Frusina | 6-3,5-7,6-7 |