Stadium: Tennis Club Crvena Zvezda Indoor - Court 05 Round: 29 Ground: Clay
Referee:
| Challenger Sofia | 2025/08/17 07:00 | Svyatoslav Gulin v Georgi Georgiev | 2-6,6-2,6-4 |
| ITF M15 Kursumlijska Banja | 2025/08/03 08:00 | Svyatoslav Gulin v Tommaso Compagnucci | 2-6,4-6 |
| ITF M15 Kursumlijska Banja | 2025/08/02 08:00 | Svyatoslav Gulin v Alexandre Aubriot | 6-0,7-6 |
| Challenger Bunschoten | 2025/07/13 12:50 | Svyatoslav Gulin v Niels Visker | 7-6,6-7,3-6 |
| ITF M15 Kursumlijska Banja | 2025/06/22 08:00 | Benjamin Torrealba v Svyatoslav Gulin | 6-4,5-7,2-6 |
| ITF M15 Kursumlijska Banja | 2025/06/21 08:00 | Denis Klok v Svyatoslav Gulin | 3-6,2-6 |
| ITF M15 Kursumlijska Banja | 2025/06/15 08:00 | Svyatoslav Gulin v Felix Gill | 3-6,7-6,6-1 |
| ITF M15 Kursumlijska Banja | 2025/06/14 07:00 | Svyatoslav Gulin v Denis Klok | 6-1,6-2 |
| UTR Pro Beograd | 2025/08/16 08:40 | Marko Nikolic v Novak Ivanovic | 6-2,6-3 |
| UTR Pro Beograd | 2025/08/15 07:00 | Aaron Gil Garcia v Marko Nikolic | 6-4,6-4 |
| UTR Pro Beograd | 2025/08/14 10:30 | Maxwell Castle v Marko Nikolic | 2-6,2-6 |
| UTR Pro Beograd | 2025/08/13 11:15 | Semen Pankin v Marko Nikolic | 6-1,6-1 |
| UTR Pro Beograd | 2025/08/11 07:00 | Valentin Guadagno v Marko Nikolic | 7-5,6-0 |
| ITF M15 Kursumlijska Banja | 2025/06/24 07:30 | Paul Barbier Gazeu v Marko Nikolic | 6-3,6-2 |
| ITF M15 Kursumlijska Banja | 2025/05/28 09:17 | Marko Nikolic v Sean Hess | 4-6,3-6 |
| ITF M15 Kursumlijska Banja | 2025/05/21 07:00 | Marko Nikolic v Gregor Ramskogler | 4-6,7-6,4-6 |