Stadium: Court 4 Round: 25 Ground: Hardcourt outdoor
| Challenger Nur-Sultan | 2021/07/20 06:05 | Alexey Zakharov v Malek Jaziri | 0-6,2-6 |
| Challenger Nur-Sultan | 2021/07/11 04:00 | Alexey Zakharov v Yan Bondarevskiy | 7-5,4-6,2-6 |
| ITF M15 St Petersburg | 2021/04/16 07:55 | Matic Spec v Alexey Zakharov | 6-2,6-4 |
| ITF M15 St Petersburg | 2021/04/15 09:45 | Constantin Bittoun Kouzmine v Alexey Zakharov | 4-6,4-6 |
| ITF M15 St Petersburg | 2021/04/14 09:55 | Egor Noskin v Alexey Zakharov | 2-6,6-1,2-6 |
| ITF M15 St Petersburg | 2021/04/08 10:45 | Sarp Agabigun v Alexey Zakharov | 6-2,6-4 |
| ITF M15 St Petersburg | 2021/04/07 07:00 | Naoki Tajima v Alexey Zakharov | 3-6,6-1,3-6 |
| ITF M15 Kazan | 2021/03/13 08:00 | Alexey Zakharov v Alibek Kachmazov | 7-5,6-3 |
| ITF M15 Eindhoven | 2023/08/02 14:00 | Christian Sigsgaard v Tom Gentzsch | 6-2,4-6,3-6 |
| ITF M15 Eindhoven | 2023/08/01 10:25 | Pepijn Bastiaansen v Christian Sigsgaard | 2-6,3-6 |
| ITF M15 Vejle | 2023/07/29 09:25 | Christian Sigsgaard v Elmer Moller | 2-6,3-6 |
| ITF M15 Vejle | 2023/07/28 08:00 | Christian Sigsgaard v Maxence Rivet | 6-3,6-1 |
| ITF M15 Vejle | 2023/07/27 12:50 | Georgii Kravchenko v Christian Sigsgaard | 4-6,3-6 |
| ITF M15 Vejle | 2023/07/26 09:25 | Eero Vasa v Christian Sigsgaard | 6-7,2-6 |
| ITF M25 Risskov/Aarhus | 2023/06/16 10:00 | Ergi Kirkin v Christian Sigsgaard | 6-7,6-3,6-4 |
| ITF M25 Risskov/Aarhus | 2023/06/15 10:15 | Christian Sigsgaard v Karl Friberg | 6-3,6-0 |