Stadium: Court 1 Round: 19 Ground: Carpet indoor
| Challenger - Eckental | 2021/10/31 10:35 | Alexander Erler v Artem Dubrivnyy | 6-1,6-3 |
| ATP - Wenen | 2021/10/23 09:00 | Alexander Erler v Gianluca Mager | 7-6,2-6,4-6 |
| Challenger - Boekarest | 2021/09/20 11:20 | Vitaliy Sachko v Alexander Erler | 6-2,6-2 |
| Challenger - Tulln | 2021/09/06 12:10 | Alexander Erler v Lukas Rosol | 4-6,7-5,1-6 |
| Challenger - Como | 2021/08/31 08:00 | Riccardo Bonadio v Alexander Erler | 3-6,6-3,6-3 |
| Challenger - Como | 2021/08/30 09:00 | Filippo Baldi v Alexander Erler | 6-7,4-6 |
| Challenger - Como | 2021/08/29 11:45 | Marcello Serafini v Alexander Erler | 1-6,6-3,6-7 |
| Challenger - Warschau | 2021/08/25 12:40 | Nicolas Kicker v Alexander Erler | 2-6,7-5,6-3 |
| Challenger - Eckental | 2021/10/31 09:00 | Henri Squire v Shintaro Mochizuki | 6-4,6-2 |
| Challenger Ismaning | 2021/10/27 12:20 | Henri Squire v Ruben Bemelmans | 3-6,4-6 |
| ITF M25 - Hamburg | 2021/10/24 10:00 | Henri Squire v Jakub Paul | 4-6,2-6 |
| ITF M25 - Hamburg | 2021/10/23 10:00 | Henri Squire v Johannes Haerteis | 6-4,6-4 |
| ITF M25 - Hamburg | 2021/10/22 12:40 | Henri Squire v Lenny Hampel | 6-4,6-4 |
| ITF M25 - Hamburg | 2021/10/21 09:45 | Daniel Masur v Henri Squire | 4-6,4-6 |
| ITF M25 - Hamburg | 2021/10/19 11:25 | Henri Squire v Milan Welte | 6-2,6-2 |
| ITF M25 Skopje | 2021/10/01 13:30 | Riccardo Balzerani v Henri Squire | 2-6,4-6 |