Stadium: Court 6 Round: 25 Ground: Hardcourt indoor
| ITF M15 Kazan | 2021/03/10 15:10 | Yanki Erel v Cozbinov, Alexander | 6-3,6-4 |
| ITF M15 St Petersburg | 2021/04/09 10:50 | Illya Beloborodko v Yanki Erel | 7-6,2-6,6-3 |
| ITF M15 St Petersburg | 2021/04/08 11:15 | Yanki Erel v Kravchuk, Konstantin | 6-4,6-1 |
| ITF M15 St Petersburg | 2021/04/07 07:00 | Davydov, Ivan v Yanki Erel | 2-6,3-6 |
| ITF M15 St Petersburg | 2021/04/05 06:55 | Yanki Erel v Recek, Dominik | 7-5,6-2 |
| ITF M15 St Petersburg | 2021/04/04 08:25 | Yanki Erel v Mert Alkaya | 6-1,7-5 |
| ITF - M15 Antalya | 2021/03/17 08:00 | Korolev, Vladimir v Yanki Erel | 2-6,6-0,6-1 |
| ITF M15 Kazan | 2021/03/13 11:30 | Yanki Erel v Evgeny Philippov | 6-1,6-2 |
| ITF M15 Kazan | 2021/03/12 07:00 | Yanki Erel v Fayziev, Sanjar | 6-3,3-6,6-3 |
| ITF M15 St Petersburg | 2021/04/10 08:00 | Cozbinov, Alexander v Nedelko, Ivan | 6-2,4-6,3-6 |
| ITF M15 St Petersburg | 2021/04/09 08:00 | Cozbinov, Alexander v Dubrivnyy, Artem | 6-4,6-7,6-3 |
| ITF M15 St Petersburg | 2021/04/08 09:00 | Tyurnev, Evgeny v Cozbinov, Alexander | 6-2,3-6,2-6 |
| ITF M15 St Petersburg | 2021/04/07 08:30 | Cozbinov, Alexander v Boris Pokotilov | 6-0,6-0 |
| ITF - M15 Antalya | 2021/03/30 10:00 | Fayziev, Sanjar v Cozbinov, Alexander | 6-4,6-3 |
| ITF - M15 Antalya | 2021/03/21 07:00 | Cozbinov, Alexander v Taiyo Yamanaka | 3-6,3-6 |
| ITF - M15 Antalya | 2021/03/18 07:00 | Matheus P De Almeida v Cozbinov, Alexander | 6-2,6-4 |
| ITF - M15 Antalya | 2021/03/17 10:00 | Cozbinov, Alexander v Vanneste, Jeroen | 6-0,6-3 |