Stadium: Court 3 Round: 25 Ground: Clay
| ITF M25 Telfs | 2021/07/19 09:00 | Apostol, Bogdan Ionut v Filip Misolic | 6-7,1-6 |
| ITF M25 Telfs | 2021/07/18 14:30 | Apostol, Bogdan Ionut v Lukas Neumayer | 6-7,6-2,6-4 |
| ITF M25 Telfs | 2021/07/18 09:20 | Apostol, Bogdan Ionut v Alexander Shevchenko | 4-6,6-3,13-11 |
| ITF M25 Telfs | 2021/07/16 08:50 | Apostol, Bogdan Ionut v Veldheer, Mick | 6-4,5-7,7-5 |
| ITF M25 Telfs | 2021/07/14 07:55 | Vanneste, Jeroen v Apostol, Bogdan Ionut | 2-6,3-6 |
| ITF M15 Poprad | 2021/07/06 10:20 | George Loffhagen v Apostol, Bogdan Ionut | 6-3,6-1 |
| UTR Pro Tennis Series Bucharest | 2021/05/23 07:40 | Apostol, Bogdan Ionut v Borza, Bogdan | 4-6,3-2 |
| UTR Pro Tennis Series Bucharest | 2021/05/22 09:42 | Apostol, Bogdan Ionut v Botezan, George | 3-6,6-2,6-3 |
| ITF M25 Telfs | 2021/07/13 09:00 | Kalenichenko, Danylo v Kirill Kivattsev | 4-6,3-6 |
| ITF M15 Bergamo | 2021/06/23 07:30 | Kalenichenko, Danylo v Eremin, Edoardo | 1-6,4-6 |
| ITF M15 Novomoskovsk | 2021/06/06 07:00 | Kalenichenko, Danylo v Zukas, Matias | 4-6,6-0,4-6 |
| ITF M15 Novomoskovsk | 2021/06/05 07:30 | Alex M Pujolras v Kalenichenko, Danylo | 4-6,6-2,4-6 |
| ITF M15 Novomoskovsk | 2021/06/04 12:30 | Kalenichenko, Danylo v Alexander Zgirovsky | 6-2,6-3 |
| ITF M15 Novomoskovsk | 2021/06/04 09:30 | Kalenichenko, Danylo v Fermin Tenti | 6-1,6-4 |
| ITF M15 Novomoskovsk | 2021/06/03 14:00 | Kalenichenko, Danylo v Pujol Navarro, Bruno | 3-6,6-4,10-7 |
| ITF M15 Novomoskovsk | 2021/05/26 06:15 | Kalenichenko, Danylo v Fermin Tenti | 4-6,2-6 |