Stadion: Court 3 Round: 19 Ground: Clay
| Challenger - Biella | 2021/05/02 11:00 | Tatsuma Ito v Viktor Galovic | 4-6,3-6 |
| Challenger - Rom - Qualifikation | 2021/04/25 08:00 | Viktor Galovic v Evgeny Karlovskiy | 3-6,4-6 |
| Challenger - Split - Qualifikation | 2021/04/11 09:00 | Zdenek Kolar v Viktor Galovic | 6-1,6-4 |
| Challenger - Potchefstroom | 2021/02/16 09:35 | Liam Broady v Viktor Galovic | 6-3,6-1 |
| Challenger - Potchefstroom | 2021/02/08 10:50 | Peter Polansky v Viktor Galovic | 6-2,3-6,7-6 |
| ITF - M15 - Antalya | 2021/01/21 09:55 | Nicolae Frunza v Viktor Galovic | 6-2,7-5 |
| ATP - Delray Beach | 2021/01/06 16:00 | Viktor Galovic v Roberto Quiroz | 3-6,5-7 |
| ATP - Delray Beach | 2021/01/05 15:00 | Viktor Galovic v Mohamed Aziz Dougaz | 6-4,6-3 |
| Challenger - Biella | 2021/05/02 12:30 | Stefano Reitano v Dimitar Kuzmanov | 6-2,2-6,2-6 |
| Challenger - Oeiras | 2021/04/07 14:00 | Dimitar Kuzmanov v Ernesto Escobedo | 6-2,6-2 |
| Challenger - Oeiras | 2021/04/05 12:25 | Dimitar Kuzmanov v Lucas Miedler | 6-1,6-0 |
| Challenger - Zadar | 2021/03/28 10:00 | Nikola Milojevic v Dimitar Kuzmanov | 2-6,6-2,7-6 |
| Challenger - Zadar | 2021/03/26 11:40 | Dimitar Kuzmanov v Blaz Kavcic | 6-4,6-1 |
| Challenger - Zadar | 2021/03/25 10:45 | Dimitar Kuzmanov v Zdenek Kolar | 6-4,6-3 |
| Challenger - Zadar | 2021/03/23 12:50 | Gian Marco Moroni v Dimitar Kuzmanov | 4-6,4-6 |
| ATP - Dubai | 2021/03/13 10:05 | Emil Ruusuvuori v Dimitar Kuzmanov | 7-6,4-6,6-1 |