| UTR Pro Tennis Series Zadar | 2021/11/16 12:00 | Valerii Naumenko v Vladimir Popov | 3-6,3-6 |
| UTR Pro Tennis Series Zadar | 2021/11/15 12:00 | Robert Rumler v Valerii Naumenko | 6-0,6-0 |
| UTR Pro Tennis Series Zadar | 2021/11/16 12:00 | Robert Rumler v Duje Kekez | 2-6,4-6 |
| UTR Pro Tennis Series Zadar | 2021/11/14 12:00 | Vladimir Popov v Duje Kekez | 0-6,2-6 |
| UTR Pro Tennis Series Nis | 2021/10/09 10:15 | Alexander Lazov v Duje Kekez | 6-3,3-6,5-1 |
| 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 |