| UTR Pro Tennis Series Copenhagen | 2021/10/18 11:30 | Zmak, Deni v Landa, Maxim | 6-0,5-1 |
| UTR Pro Tennis Series Zadar | 2021/10/03 09:30 | Zmak, Deni v Rogic Hadzalic, Alen | 6-4,7-5 |
| UTR Pro Tennis Series Zadar | 2021/10/02 10:00 | Zmak, Deni v Yanais Laurent | 5-4 |
| UTR Pro Tennis Series Zadar | 2021/10/01 09:30 | Zmak, Deni v Michalis Sakellaridis | 6-2,7-5 |
| UTR Pro Tennis Series Zadar | 2021/09/30 12:00 | Zmak, Deni v Ivan Denisov | 2-6,6-2,6-5 |
| UTR Pro Tennis Series Zadar | 2021/09/29 15:00 | Ivan Liutarevich v Zmak, Deni | 4-6,6-4,6-6 |
| UTR Pro Tennis Series Zadar | 2021/09/28 11:00 | Maxim Krapivin v Zmak, Deni | 2-6,2-5 |
| UTR Pro Tennis Series Portoroz | 2021/08/29 08:00 | Kolisnyk, Olexiy v Zmak, Deni | 4-6,6-2,6-3 |
| UTR Pro Tennis Series Copenhagen | 2021/10/18 07:00 | Arslan Temirhanov v Albert P Hansen | 6-2,6-2 |