Stadium: Court 4 Round: 27 Ground: Hardcourt indoor
| ITF - M15 St Petersborg | 2021/04/15 12:00 | Patrik Rikl v Yanki Erel | 3-6,5-7 |
| ITF - M15 St Petersborg | 2021/04/14 07:00 | Yanki Erel v Alexander Cozbinov | 7-6,7-6 |
| ITF - M15 St Petersborg | 2021/04/09 10:50 | Illya Beloborodko v Yanki Erel | 7-6,2-6,6-3 |
| ITF - M15 St Petersborg | 2021/04/08 11:15 | Yanki Erel v Konstantin Kravchuk | 6-4,6-1 |
| ITF - M15 St Petersborg | 2021/04/07 07:00 | Ivan Davydov v Yanki Erel | 2-6,3-6 |
| ITF - M15 St Petersborg | 2021/04/05 06:55 | Yanki Erel v Dominik Recek | 7-5,6-2 |
| ITF - M15 St Petersborg | 2021/04/04 08:25 | Yanki Erel v Mert Alkaya | 6-1,7-5 |
| ITF M15 - Antalya | 2021/03/17 08:00 | Vladimir Korolev v Yanki Erel | 2-6,6-0,6-1 |
| ITF - M15 St Petersborg | 2021/04/15 10:25 | Sarp Agabigun v Konstantin Kravchuk | 5-7,6-2,6-3 |
| ITF - M15 St Petersborg | 2021/04/13 09:00 | Timur Kiyamov v Sarp Agabigun | 6-7,4-6 |
| ITF - M15 St Petersborg | 2021/04/12 07:00 | Sarp Agabigun v Dominik Recek | 6-4,6-2 |
| ITF M15 - St Petersborg - Kvalifikation | 2021/04/11 09:20 | Sarp Agabigun v Mert Alkaya | 6-4,6-3 |
| ITF - M15 St Petersborg | 2021/04/09 08:00 | Ivan Nedelko v Sarp Agabigun | 6-1,6-4 |
| ITF - M15 St Petersborg | 2021/04/08 10:45 | Sarp Agabigun v Alexey Zakharov | 6-2,6-4 |
| ITF - M15 St Petersborg | 2021/04/07 11:15 | Sarp Agabigun v Aleksei Abazov | 6-0,6-0 |
| ITF - M15 St Petersborg | 2021/04/05 06:55 | Sarp Agabigun v Igor Trunov | 6-0,6-2 |