Stadion: Hard Court 2 Round: 62 Ground: Hardcourt outdoor
| ITF - M15 - Heraklion | 2021/11/07 07:00 | Christian Fellin v Igor Shrolik | 3-6,0-6 |
| ITF - M15 - Heraklion | 2021/11/02 07:00 | Ioannis Stamoulos v Christian Fellin | 3-6,6-4,10-8 |
| ITF - M15 - Heraklion | 2021/11/01 11:00 | Drew Van Orderlain v Christian Fellin | 6-3,2-6,6-10 |
| ITF - M15 - Selva Gardena | 2021/10/25 08:50 | Alessandro Pecci v Christian Fellin | 6-3,7-5 |
| ITF - M15 - Selva Gardena | 2021/10/24 12:55 | Luca Teboul v Christian Fellin | 4-6,4-6 |
| ITF - M15 - Bad Waltersdorf | 2021/08/31 07:00 | Matic Dimic v Christian Fellin | 6-1,6-1 |
| ITF - M15 - Bad Waltersdorf | 2021/08/30 09:00 | Christian Fellin v Simone Cacciapuoti | 6-2,6-4 |
| ITF - M25 - Lesa | 2021/08/22 08:40 | Alessio Tramontin v Christian Fellin | 4-6,6-0,10-8 |
| 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 - Zlatibor | 2021/09/16 09:40 | Oleksandr Ovcharenko v Veljko Krstic | 6-1,6-1 |