| UTR Pro Tennis Series Barcelona | 2021/11/25 16:00 | Alvaro Bueno Gil v Marat Deviatiarov | 0-6,4-1 |
| UTR Pro Tennis Series Barcelona | 2021/11/25 08:00 | Ignasi De Rueda De Genover v Marat Deviatiarov | 7-6,6-6 |
| ITF - Sharm El Sheikh M15 | 2021/10/22 07:55 | Marat Deviatiarov v Lukas Krainer | 4-6,3-6 |
| ITF - Sharm El Sheikh M15 | 2021/10/21 08:00 | Marat Deviatiarov v Neil Oberleitner | 6-3,7-5 |
| ITF - Sharm El Sheikh M15 | 2021/10/20 12:25 | Marat Deviatiarov v Andrea Guerrieri | 6-4,6-0 |
| ITF - Sharm El Sheikh M15 | 2021/10/14 10:35 | Gabriel Decamps v Marat Deviatiarov | 6-4,5-7,6-0 |
| ITF - Sharm El Sheikh M15 | 2021/10/13 09:35 | Alexandros Skorilas v Marat Deviatiarov | 3-6,0-6 |
| ITF - Ulcinj M15 | 2021/09/15 10:00 | Marat Deviatiarov v Franco Emanuel Egea | 3-6,3-6 |
| UTR Pro Tennis Series Barcelona | 2021/11/23 10:30 | Alvaro Bueno Gil v Fermin Calvo Barcelo | 6-4,6-1 |
| UTR Pro Tennis Series Barcelona | 2021/11/22 11:00 | Fermin Calvo Barcelo v Anthony Genov | 3-6,1-6 |
| ITF - Nules M15 | 2021/11/15 08:30 | Mario Mansilla Diez v Fermin Calvo Barcelo | 6-2,6-3 |
| ITF - Benicarlo M15 | 2021/11/07 11:00 | Fermin Calvo Barcelo v Jay Friend | 0-6,5-7 |
| ITF - Madryt M25 | 2021/10/24 09:30 | Serafin Zund v Fermin Calvo Barcelo | 6-4,6-4 |
| ITF - Quinta Do Lago M25 | 2021/10/19 09:00 | Stuart Parker v Fermin Calvo Barcelo | 6-4,6-2 |
| ITF - Quinta Do Lago M25 | 2021/10/18 14:05 | Fermin Calvo Barcelo v Raphael Calzi | 6-3,6-3 |
| ITF - Quinta Do Lago M25 | 2021/10/17 12:00 | Fermin Calvo Barcelo v Jaime Faria | 7-6,6-7,10-8 |