Stadium: Court 4 Round: 27 Ground: Hardcourt indoor
| 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 |
| ITF M15 Kazan | 2021/03/10 15:10 | Yanki Erel v Cozbinov, Alexander | 6-3,6-4 |
| ITF M15 St Petersburg | 2021/02/12 11:35 | Jan Choinski v Cozbinov, Alexander | 6-2,6-7,6-4 |
| ITF M15 St Petersburg | 2021/04/08 07:00 | Ratniuk, Maxim v Dubrivnyy, Artem | 2-6,1-6 |
| 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 |