Stadium: Court 8 Round: 44 Ground: Clay
| ITF M15 Heraklion | 2021/11/14 07:00 | Christian Fellin v Veljko Krstic | 7-6,1-6,10-8 |
| ITF M15 Heraklion | 2021/11/07 09:00 | Raffael Schaer v Veljko Krstic | 6-4,6-7,10-6 |
| ITF M15 Heraklion | 2021/11/01 08:00 | Veljko Krstic v Alessandro Spadola | 5-7,2-6 |
| UTR Pro Tennis Series Nis | 2021/10/09 08:00 | Aleksa Mardjonovic v Veljko Krstic | 6-3,6-4 |
| UTR Pro Tennis Series Nis | 2021/10/08 14:15 | Stefan Ivic v Veljko Krstic | 6-4,3-6,1-5 |
| UTR Pro Tennis Series Nis | 2021/10/07 08:30 | Lawrence Bataljin v Veljko Krstic | 7-6,3-6,5-7 |
| UTR Pro Tennis Series Nis | 2021/10/05 09:30 | Ivan Liutarevich v Veljko Krstic | 5-7,6-4,6-2 |
| UTR Pro Tennis Series Nis | 2021/10/04 08:30 | Veljko Krstic v Oleksandr Bielinskyi | 5-7,6-1,6-3 |
| ITF M15 Antalya | 2021/12/14 06:20 | Mert Ramadan v Iacopo Sada | 3-6,6-7 |
| ITF M15 Antalya | 2021/12/12 06:30 | Elesey Avtamonov v Mert Ramadan | 1-6,4-6 |
| ITF M15 Antalya | 2021/12/06 11:20 | Mert Ramadan v Giulio Colacioppo | 2-6,3-6 |
| ITF M15 Antalya | 2021/12/05 08:00 | Mert Ramadan v Mikhail Galyamov | 6-3,7-6 |
| ITF M15 Antalya | 2021/11/29 06:00 | Mert Ramadan v Credit Chaiyarin | 5-7,6-7 |
| ITF M15 Antalya | 2021/11/21 06:30 | Mert Ramadan v David Hough | 1-6,1-6 |
| ITF M15 Antalya | 2021/10/31 07:00 | Mert Ramadan v Aziz Dadabaev | 3-6,2-6 |
| ITF M15 Antalya | 2021/10/24 07:00 | Mert Ramadan v Mark Havlicek | 5-7,5-7 |