Stadium: Court 1 Round: 14 Ground: Hardcourt indoor
| ITF M25 Norman | 2019/10/02 16:20 | Cozbinov, Alexander v Erler, Alexander | 7-6,3-6,6-4 |
| Challenger Eckental | 2021/11/02 13:15 | Henri Squire v Erler, Alexander | 7-6,2-6,7-6 |
| Challenger Eckental | 2021/11/01 10:00 | Erler, Alexander v Henri Squire | 4-6,2-6 |
| Challenger Eckental | 2021/10/31 10:35 | Erler, Alexander v Dubrivnyy, Artem | 6-1,6-3 |
| ATP Vienna | 2021/10/23 09:00 | Erler, Alexander v Gianluca Mager | 7-6,2-6,4-6 |
| Challenger Bucharest | 2021/09/20 11:20 | Vitaliy Sachko v Erler, Alexander | 6-2,6-2 |
| Challenger Tulln | 2021/09/06 12:10 | Erler, Alexander v Lukas Rosol | 4-6,7-5,1-6 |
| Challenger Como | 2021/08/31 08:00 | Riccardo Bonadio v Erler, Alexander | 3-6,6-3,6-3 |
| Challenger Como | 2021/08/30 09:00 | Baldi, Filippo v Erler, Alexander | 6-7,4-6 |
| ITF M25 Hamburg | 2021/10/19 14:00 | Hampel, Lenny v Cozbinov, Alexander | 6-4,6-2 |
| ITF M15 Sozopol | 2021/10/14 17:15 | Cozbinov, Alexander v Tepavac, Marko | 2-6,5-7 |
| ITF M15 Sozopol | 2021/10/14 12:30 | Cozbinov, Alexander v Valentin Vanta | 6-2,6-1 |
| ITF M15 Sozopol | 2021/10/08 07:00 | Bondarevskiy, Yan v Cozbinov, Alexander | 1-6,6-2,6-1 |
| ITF M15 Sozopol | 2021/10/07 06:50 | Anthony Genov v Cozbinov, Alexander | 3-6,1-6 |
| ITF M15 Sozopol | 2021/10/06 09:35 | Dimitrov, Martin v Cozbinov, Alexander | 1-6,3-6 |
| ITF M25 Skopje | 2021/10/01 12:30 | Cozbinov, Alexander v Matteo Arnaldi | 0-6,1-6 |
| ITF M25 Skopje | 2021/10/01 08:15 | Cozbinov, Alexander v Battaglino, Stefano | 6-2,7-5 |