| 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 |
| UTR Pro Tennis Series Zadar | 2021/09/28 12:30 | Duje Kekez v Stefanos Sakellaridis | 7-6,6-3 |
| UTR Pro Tennis Series Nis | 2021/10/07 08:30 | Ivan Denisov v Lazar Radenkovic | 6-0,6-1 |
| UTR Pro Tennis Series Nis | 2021/10/06 10:00 | Petar Pjevcevic v Lazar Radenkovic | 4-6,6-3,6-2 |
| UTR Pro Tennis Series Nis | 2021/10/04 08:30 | Vladimir Popov v Lazar Radenkovic | 6-1,5-2 |