| UTR Pro Tennis Series Zadar | 2021/11/15 12:00 | Olexiy Kolisnyk v Christos Keisidis | 7-5,3-6,4-6 |
| UTR Pro Tennis Series Nis | 2021/10/10 08:00 | Christos Keisidis v Vladimir Popov | 6-1,5-2 |
| UTR Pro Tennis Series Nis | 2021/10/09 11:00 | Christos Keisidis v Lawrence Bataljin | 6-4,6-2 |
| UTR Pro Tennis Series Nis | 2021/10/08 15:45 | Dusan Trunic v Christos Keisidis | 2-6,2-5 |
| UTR Pro Tennis Series Nis | 2021/10/07 08:30 | George Botezan v Christos Keisidis | 6-3,6-3 |
| UTR Pro Tennis Series Nis | 2021/10/05 14:00 | Aleksa Mardjonovic v Christos Keisidis | 2-6,7-5,6-4 |
| 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 Zadar | 2021/10/03 09:30 | Admir Kalender v Christos Keisidis | 6-2,6-0 |
| UTR Pro Tennis Series Zadar | 2021/11/15 12:00 | Denis Parshutin v Alexander Chepik | 6-7,3-5 |
| ITF M15 Vyshkovo | 2021/09/20 06:00 | Denis Parshutin v Riccardo Tavilla | 1-6,1-6 |
| UTR Pro Tennis Series Portoroz | 2021/08/28 08:30 | Denis Parshutin v Vladan Tadic | 6-4,1-6,3-6 |
| UTR Pro Tennis Series Portoroz | 2021/08/27 15:00 | Denis Parshutin v Timur Maulenov | 6-3,4-6,3-6 |
| UTR Pro Tennis Series Portoroz | 2021/08/26 08:30 | Denis Parshutin v Deni Zmak | 3-6,0-6 |
| UTR Pro Tennis Series Portoroz | 2021/08/25 13:00 | Egor Novikov v Denis Parshutin | 6-2,2-6,6-0 |
| UTR Pro Tennis Series Portoroz | 2021/08/25 08:30 | Tilen Zitnik v Denis Parshutin | 6-7,6-7 |
| UTR Pro Tennis Series Portoroz | 2021/08/22 07:00 | George Botezan v Denis Parshutin | 6-3,5-7,6-2 |