| UTR Pro Tennis Series Pazardzhik | 2021/07/12 09:00 | Anthony Genov v Adriano Dzhenev | 4-6,6-6 |
| UTR Pro Tennis Series Beograd | 2021/07/11 08:30 | Olexiy Kolisnyk v Jean Thirouin | 7-6,3-6,3-5 |
| UTR Pro Tennis Series Beograd | 2021/07/10 11:30 | Olexiy Kolisnyk v Luka Pavlovic | 4-6,6-1,6-2 |
| UTR Pro Tennis Series Beograd | 2021/07/09 07:30 | Constant De La Bassetiere v Olexiy Kolisnyk | 6-7,4-5 |
| UTR Pro Tennis Series Beograd | 2021/07/08 09:00 | Nikola Slavic v Olexiy Kolisnyk | 1-6,4-6 |
| UTR Pro Tennis Series Beograd | 2021/07/07 10:30 | Dusan Obradovic v Olexiy Kolisnyk | 6-0,5-4 |
| UTR Pro Tennis Series Beograd | 2021/07/05 07:30 | Michalis Sakellaridis v Olexiy Kolisnyk | 3-5 |
| ITF M15 Antalya | 2021/06/30 08:50 | Olexiy Kolisnyk v Louroi Martinez | 6-2,2-6,1-6 |
| ITF M15 Antalya | 2021/06/29 06:30 | Olexiy Kolisnyk v Lorenzo Joaquin Rodriguez | 6-2,6-1 |