Stadium: Court 6 Round: 26 Ground: Hardcourt indoor
| ITF M15 St Petersburg | 2021/02/10 06:50 | Dubrivnyy, Artem v Ratniuk, Maxim | 6-2,6-3 |
| 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 St Petersburg | 2021/02/03 08:35 | Alexander Vasilenko v Ratniuk, Maxim | 6-1,6-4 |
| ITF M15 St Petersburg | 2021/04/06 07:00 | Jakub Paul v Dubrivnyy, Artem | 5-7,1-6 |
| Challenger St. Petersburg | 2021/03/06 09:00 | Altug Celikbilek v Dubrivnyy, Artem | 5-7,6-2,6-3 |
| Challenger St. Petersburg | 2021/03/05 08:00 | Dubrivnyy, Artem v Andrey Kuznetsov | 6-3,6-7,6-3 |
| Challenger St. Petersburg | 2021/03/03 12:15 | Viktor Durasovic v Dubrivnyy, Artem | 5-7,6-3,3-6 |
| Challenger St. Petersburg | 2021/03/02 09:45 | Igor Sijsling v Dubrivnyy, Artem | 6-3,4-6,3-6 |
| Challenger St. Petersburg | 2021/03/01 08:30 | Dubrivnyy, Artem v Skander Mansouri | 4-6,7-6,6-0 |
| Challenger St. Petersburg | 2021/02/28 10:45 | Kravchuk, Konstantin v Dubrivnyy, Artem | 6-7,4-6 |
| ITF M15 St Petersburg | 2021/02/11 08:30 | Dubrivnyy, Artem v Martin Krumich | 4-6,6-1,5-7 |