Stadium: CENTER COURT (7) Round: 26 Ground: Clay
| ITF M15 Novomoskovsk | 2021/05/26 08:20 | Oleksandr Ovcharenko v Deviatiarov, Marat | 7-6,6-4 |
| ITF M15 Ulcinj | 2021/09/08 08:00 | Deviatiarov, Marat v Saito, Takashi | 6-3,6-4 |
| UTR Pro Tennis Series Barcelona | 2021/08/15 08:00 | Andrey Chepelev v Deviatiarov, Marat | 6-1,6-7,2-6 |
| UTR Pro Tennis Series Barcelona | 2021/08/14 08:00 | Fermin Tenti v Deviatiarov, Marat | 0-6,1-6 |
| UTR Pro Tennis Series Barcelona | 2021/08/12 10:00 | Pujol Navarro, Bruno v Deviatiarov, Marat | 4-6,6-4,5-6 |
| UTR Pro Tennis Series Barcelona | 2021/08/10 08:30 | Fomba, Luc v Deviatiarov, Marat | 5-7,3-6 |
| UTR Pro Tennis Series Barcelona | 2021/08/09 11:00 | Deviatiarov, Marat v Federico Zeballos | 5-7,1-6 |
| UTR Pro Tennis Series Barcelona | 2021/08/07 11:00 | Kolisnyk, Olexiy v Deviatiarov, Marat | 6-4,7-5 |
| UTR Pro Tennis Series Barcelona | 2021/08/06 11:30 | Deviatiarov, Marat v Guerrero Melgar, Angel | 6-2,6-1 |
| ITF M15 Ulcinj | 2021/09/07 10:10 | Oleksandr Ovcharenko v Kekez, Duje | 6-1,4-6,6-4 |
| ITF M15 Ulcinj | 2021/08/31 08:00 | Oleksandr Ovcharenko v Gorazd Srbljak | 5-7,4-6 |
| Challenger - Barletta | 2021/08/22 10:00 | Aidan Mchugh v Oleksandr Ovcharenko | 6-2,6-4 |
| ITF M15 Pescara | 2021/08/18 08:30 | Giorgio Tabacco v Oleksandr Ovcharenko | 6-4,3-6,6-1 |
| ITF M15 Cairo | 2021/08/06 08:00 | Juan Bautista Torres v Oleksandr Ovcharenko | 6-4,6-2 |
| ITF M15 Cairo | 2021/08/05 09:40 | Mathys Erhard v Oleksandr Ovcharenko | 4-6,1-6 |
| ITF M15 Cairo | 2021/08/04 10:00 | Oleksandr Ovcharenko v Perchicot, Mathieu | 7-6,6-2 |
| ITF M15 Cairo | 2021/07/28 08:00 | Perchicot, Mathieu v Oleksandr Ovcharenko | 6-3,1-6,6-2 |