Stadium: Court 4 Round: 25 Ground: Hardcourt indoor
| ITF Ukraine F1 | 2015/05/13 07:30 | Deviatiarov, Marat v Ratniuk, Maxim | 7-5,6-3 |
| ITF Turkey F3 | 2015/02/27 07:00 | Ratniuk, Maxim v Deviatiarov, Marat | 6-4,2-6,8-10 |
| ITF M15 St Petersburg | 2021/04/08 07:00 | Ratniuk, Maxim v Dubrivnyy, Artem | 2-6,1-6 |
| ITF M15 St Petersburg | 2021/04/05 08:30 | Ratniuk, Maxim v Kiyamov, Timur | 6-4,6-7,12-10 |
| ITF M15 St Petersburg | 2021/04/04 07:00 | Ratniuk, Maxim v Maksim Starostin | 6-4,6-0 |
| ITF M15 Kazan | 2021/03/11 08:00 | Alexandr Binda v Ratniuk, Maxim | 4-6,6-3,6-4 |
| ITF M15 Kazan | 2021/03/10 13:40 | Ratniuk, Maxim v Zhurbin, Alexander | 6-0,6-3 |
| ITF M15 St Petersburg | 2021/02/10 06:50 | Dubrivnyy, Artem v Ratniuk, Maxim | 6-2,6-3 |
| ITF M15 St Petersburg | 2021/02/08 10:05 | Ratniuk, Maxim v Evgeny Philippov | 6-3,6-3 |
| ITF M15 St Petersburg Qual | 2021/02/07 15:30 | Ratniuk, Maxim v Ovcharov, Alexander | 6-1,6-3 |
| ITF - M15 Sharm El Sheikh | 2021/03/31 09:50 | Deviatiarov, Marat v Bega, Alessandro | 0-6,3-6 |
| ITF - M15 Sharm El Sheikh | 2021/03/25 07:30 | Deviatiarov, Marat v Makoto Ochi | 6-7,3-6 |
| ITF - M15 Sharm El Sheikh | 2021/03/24 07:30 | Deviatiarov, Marat v Babji Siva Atturu | 6-2,6-0 |
| ITF - M15 Sharm El Sheikh | 2021/03/17 07:30 | Deviatiarov, Marat v Petros Chrysochos | 3-6,2-6 |
| ITF M15 Kazan | 2021/03/10 11:30 | Stepin, Alexander v Deviatiarov, Marat | 6-4,7-5 |
| ITF M15 St Petersburg | 2021/02/11 12:55 | Jan Choinski v Deviatiarov, Marat | 6-4,6-7,6-1 |
| ITF M15 St Petersburg | 2021/02/10 10:40 | Alibek Kachmazov v Deviatiarov, Marat | 2-6,4-6 |
| ITF M15 St Petersburg | 2021/02/04 11:45 | Deviatiarov, Marat v Ivan Gakhov | 6-1,2-6,3-6 |