Stadium: Court 6 Round: 27 Ground: Hardcourt outdoor
| ITF - M15 Sharm El Sheikh | 2021/10/21 08:00 | Deviatiarov, Marat v Neil Oberleitner | 6-3,7-5 |
| ITF - M15 Sharm El Sheikh | 2021/10/20 12:25 | Deviatiarov, Marat v Andrea Guerrieri | 6-4,6-0 |
| ITF - M15 Sharm El Sheikh | 2021/10/14 10:35 | Gabriel Decamps v Deviatiarov, Marat | 6-4,5-7,6-0 |
| ITF - M15 Sharm El Sheikh | 2021/10/13 09:35 | Alexandros Skorilas v Deviatiarov, Marat | 3-6,0-6 |
| ITF M15 Ulcinj | 2021/09/15 10:00 | Deviatiarov, Marat v Franco Emanuel Egea | 3-6,3-6 |
| ITF M15 Ulcinj | 2021/09/09 08:30 | Deviatiarov, Marat v Oleksandr Ovcharenko | 1-6,1-6 |
| 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 |
| ITF - M15 Sharm El Sheikh | 2021/10/21 08:00 | Krainer, L. v David Poljak | 3-6,6-4,6-2 |
| ITF - M15 Sharm El Sheikh | 2021/10/20 13:40 | Leonardo Malgaroli v Krainer, L. | 6-7,2-6 |
| ITF M15 Cairo | 2021/09/22 08:00 | Marco Miceli v Krainer, L. | 6-1,6-2 |
| Challenger Tulln | 2021/09/05 09:00 | Benjamin Hassan v Krainer, L. | 6-4,6-4 |
| ITF M15 Bad Waltersdorf | 2021/09/02 08:00 | Lipovsek Puches, Tomas v Krainer, L. | 6-3,6-1 |
| ITF M15 Bad Waltersdorf | 2021/09/01 10:30 | Krainer, L. v Kaufmann, Hans Peter | 6-3,6-4 |
| ITF M15 Bad Waltersdorf | 2021/08/29 09:35 | Timo Stodder v Krainer, L. | 6-3,6-2 |
| ITF M15 Bad Waltersdorf | 2021/08/28 08:00 | Gabriel Decamps v Krainer, L. | 2-6,3-6 |