Stadium: Court 6 Round: 54 Ground: Hardcourt indoor
| 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 St Petersburg | 2021/02/03 08:35 | Alexander Vasilenko v Ratniuk, Maxim | 6-1,6-4 |
| ITF M15 St Petersburg | 2021/02/01 08:50 | Ratniuk, Maxim v Spec, Matic | 0-6,1-6 |
| ITF M15 St Petersburg | 2021/01/31 10:55 | Ratniuk, Maxim v Prudnikau, Aliaksandr | 6-4,7-6 |