Stadium: Court 9 Round: 45 Ground: Hardcourt outdoor
| ITF - M25 Pretoria | 2021/09/27 10:00 | Ethan Terblanche v Alexey Dubinin | 5-7,6-2,10-4 |
| ITF - M25 Pretoria | 2021/09/26 11:30 | Tom Saporta v Alexey Dubinin | 4-6,3-6 |
| ITF - M25 Johannesburg | 2021/09/20 08:15 | Neil Oberleitner v Alexey Dubinin | 6-0,6-1 |
| ITF - M25 Johannesburg - Calificari | 2021/09/19 07:00 | Alexey Dubinin v Tom Slabbert | 6-3,6-2 |
| ITF - M25 Johannesburg | 2021/09/13 08:50 | Wian Roothman v Alexey Dubinin | 6-1,7-5 |
| ITF - M25 Johannesburg | 2021/09/12 10:45 | Christiaan Bell v Alexey Dubinin | 1-6,2-6 |
| ITF - M15 Chornomorsk | 2021/08/30 07:00 | Ainius Sabaliauskas v Alexey Dubinin | 6-1,6-1 |
| ITF - M15 Shymkent | 2021/05/31 06:35 | Alexey Dubinin v Petr Bar Biryukov | 2-6,2-6 |
| ITF - M25 Falun | 2021/09/26 11:00 | Nikolaj Katic v Daniel Little | 6-7,4-6 |
| ITF - M25 Jonkoping | 2021/09/19 11:00 | Ben Jones v Nikolaj Katic | 6-2,6-7,10-6 |
| UTR Pro Tennis Series - Ricany | 2021/09/08 09:00 | Nikolaj Katic v Jiri Barnat | 1-6,0-2 |
| UTR Pro Tennis Series - Ricany | 2021/09/07 13:00 | Nikolaj Katic v Maxence Broville | 3-6,3-6 |
| ITF - M25 Muttenz | 2021/08/16 07:55 | Mischa Lanz v Nikolaj Katic | 7-5,6-4 |
| ITF - M15 Frederiksberg | 2021/08/01 08:00 | Adam Heinonen v Nikolaj Katic | 6-3,6-7,10-6 |
| UTR Pro Tennis Series - Copenhaga | 2021/06/19 07:00 | Nikolaj Katic v Warren Sinius | 4-5 |
| UTR Pro Tennis Series - Copenhaga | 2021/06/18 11:00 | Benjamin Hannestad v Nikolaj Katic | 6-4,6-1 |