| UTR Pro Tennis Series - Nis | 2021/10/08 18:15 | George Botezan v Alexander Lazov | 2-6,3-5 |
| UTR Pro Tennis Series - Nis | 2021/10/07 10:00 | Aleksa Mardjonovic v Alexander Lazov | 2-6,4-5 |
| UTR Pro Tennis Series - Nis | 2021/10/06 11:30 | Dusan Trunic v Alexander Lazov | 6-4,2-6,1-6 |
| UTR Pro Tennis Series - Nis | 2021/10/04 11:30 | Christos Keisidis v Alexander Lazov | 6-3,0-6,3-6 |
| UTR Pro Tennis Series - Říčany | 2021/09/18 09:00 | Antonin Bolardt v Alexander Lazov | 4-6,6-4,2-5 |
| UTR Pro Tennis Series - Říčany | 2021/09/16 07:00 | Alexander Lazov v Jan Satral | 1-6,2-6 |
| UTR Pro Tennis Series - Říčany | 2021/09/15 12:00 | Alexander Lazov v Yanais Laurent | 4-6,6-1,3-5 |
| UTR Pro Tennis Series - Říčany | 2021/09/14 09:00 | Alexander Lazov v Yann Wojcik | 6-4,3-6,6-7 |
| UTR Pro Tennis Series - Nis | 2021/10/08 17:00 | Duje Kekez v Lazar Radenkovic | 6-1,5-1 |
| UTR Pro Tennis Series - Nis | 2021/10/07 14:00 | Duje Kekez v Vladimir Popov | 6-0,5-1 |
| UTR Pro Tennis Series - Nis | 2021/10/06 10:00 | Ivan Denisov v Duje Kekez | 1-6,4-6 |
| UTR Pro Tennis Series - Nis | 2021/10/05 11:30 | Petar Pjevcevic v Duje Kekez | 3-6,6-3,2-6 |
| UTR Pro Tennis Series - Zadar | 2021/10/03 08:00 | Duje Kekez v Lawrence Bataljin | 6-1,5-1 |
| UTR Pro Tennis Series - Zadar | 2021/10/02 08:30 | Duje Kekez v Jose Antonio Rodriguez Rodriguez | 0-0 |
| UTR Pro Tennis Series - Zadar | 2021/09/30 09:30 | Duje Kekez v Drazen Petrovic | 3-6,4-5 |
| UTR Pro Tennis Series - Zadar | 2021/09/29 08:00 | Duje Kekez v Christos Keisidis | 6-2,2-6,5-6 |