Stadium: Court 3 Round: 62 Ground: Clay
| ITF - M15 Antalya | 2021/06/13 07:30 | Kuan-Yi Lee v Kolisnyk, Olexiy | 5-7,6-7 |
| ITF M15 Novomoskovsk | 2021/05/31 07:00 | Aliaksandr Liaonenka v Kolisnyk, Olexiy | 3-6,6-3,10-8 |
| ITF M15 Novomoskovsk | 2021/05/30 06:15 | Kolisnyk, Olexiy v Alcalde, Juan Ignacio | 6-3,6-4 |
| ITF M15 Novomoskovsk | 2021/05/24 12:00 | Kolisnyk, Olexiy v Alexander Zgirovsky | 7-6,2-6,8-10 |
| ITF M15 Novomoskovsk | 2021/05/23 08:00 | Kolisnyk, Olexiy v Boychuk, Roman | 6-4,2-6,10-8 |
| ITF M15 Cairo | 2021/05/05 11:00 | Jose Pereira v Kolisnyk, Olexiy | 7-5,6-0 |
| ITF M15 Cairo | 2021/05/04 08:00 | Felix Gill v Kolisnyk, Olexiy | 1-6,3-6 |
| ITF M15 Cairo | 2021/05/03 09:00 | Syed Naguib, Syed Mohd Agil v Kolisnyk, Olexiy | 1-6,1-6 |
| ITF - M15 Antalya | 2021/06/13 07:30 | Anton Semenov v Elbert Barr | 6-1,6-4 |
| ITF - M15 Antalya | 2021/06/09 09:05 | Gonzalo Lama v Anton Semenov | 6-2,6-3 |
| ITF - M15 Antalya | 2021/05/31 10:30 | Anton Semenov v Lorenzo Joaquin Rodriguez | 1-6,2-6 |
| ITF - M15 Antalya | 2021/05/25 07:00 | Paul Woerner v Anton Semenov | 6-1,6-3 |