Stadium: Court 4 Round: 29 Ground: Hardcourt indoor
| ITF M15 St Petersburg MD | 2021/04/10 12:40 | Cozbinov/Freund v Tajima N / Zakharov A | 6-4,7-5 |
| ITF M15 St Petersburg MD | 2021/04/16 11:05 | Tajima N / Zakharov A v Pecak/Satral | 3-6,6-2,11-9 |
| ITF M15 St Petersburg MD | 2021/04/15 13:45 | Tajima N / Zakharov A v Ivanov V / Ratniuk M | 2-6,6-3,13-11 |
| ITF M15 St Petersburg MD | 2021/04/13 10:30 | Altuna/Kravchuk v Tajima N / Zakharov A | 5-7,6-3,4-10 |
| ITF M15 St Petersburg MD | 2021/04/10 12:40 | Cozbinov/Freund v Tajima N / Zakharov A | 6-4,7-5 |
| ITF M15 St Petersburg MD | 2021/04/09 10:00 | Pogosian/Sheyngezikht v Tajima N / Zakharov A | 4-6,1-6 |
| ITF M15 St Petersburg MD | 2021/04/06 09:50 | Agabigun S / Erel Y v Tajima N / Zakharov A | 4-6,1-6 |
| ITF M15 St Petersburg MD | 2021/04/16 10:10 | Paul J / Steinegger Y v Cozbinov/Freund | 6-4,3-6,9-11 |
| ITF M15 St Petersburg MD | 2021/04/15 10:40 | Deviatiarov M / Igoshin A v Cozbinov/Freund | 2-6,6-3,6-10 |
| ITF M15 St Petersburg MD | 2021/04/13 12:15 | Shchaya-Zubrov/Sheyngezikht v Cozbinov/Freund | 6-7,2-6 |
| ITF M15 St Petersburg MD | 2021/04/10 12:40 | Cozbinov/Freund v Tajima N / Zakharov A | 6-4,7-5 |
| ITF M15 St Petersburg MD | 2021/04/09 12:20 | Paul J / Steinegger Y v Cozbinov/Freund | 6-7,2-6 |