Stadium: Court 1 Round: 28 Ground: Clay
| ITF - M25 Trimbach | 2021/03/12 09:55 | Elmar Ejupovic v Erler, Alexander | 7-6,6-7,6-3 |
| Challenger Ismaning | 2018/10/13 18:00 | Erler, Alexander v Elmar Ejupovic | 6-3,6-4 |
| ITF M25 Meerbusch | 2021/04/16 10:45 | Elmar Ejupovic v Peter Heller | 6-3,7-6 |
| ITF M25 Meerbusch | 2021/04/15 11:55 | Elmar Ejupovic v Niels Visker | 6-2,6-3 |
| ITF M25 Meerbusch | 2021/04/14 14:35 | Rudolf Molleker v Elmar Ejupovic | 6-7,6-4,3-6 |
| ITF - M25 Trimbach | 2021/03/14 09:55 | Gijs Brouwer v Elmar Ejupovic | 7-5,6-0 |
| ITF - M25 Trimbach | 2021/03/13 11:00 | Elmar Ejupovic v Matteo Martineau | 4-6,7-6,6-3 |
| ITF - M25 Trimbach | 2021/03/12 09:55 | Elmar Ejupovic v Erler, Alexander | 7-6,6-7,6-3 |
| ITF - M25 Trimbach | 2021/03/10 11:45 | Elmar Ejupovic v Niklas Schell | 7-6,6-4 |
| Challenger Gran Canaria | 2021/02/22 12:20 | Manuel Guinard v Elmar Ejupovic | 6-4,6-4 |
| ITF M25 Meerbusch | 2021/04/16 09:00 | Milan Welte v Erler, Alexander | 1-6,4-6 |
| ITF M25 Meerbusch | 2021/04/15 10:00 | Erler, Alexander v Mertens, Yannick | 6-3,3-6,6-1 |
| ITF M25 Meerbusch | 2021/04/14 10:30 | Erler, Alexander v Netuschil, Marvin | 6-3,6-2 |
| ITF M25 Biel | 2021/03/30 08:00 | Erler, Alexander v Kilian Feldbausch | 4-6,6-3,5-10 |
| ITF M25 Biel | 2021/03/29 08:00 | Erler, Alexander v Mischa Lanz | 6-3,6-4 |
| Challenger - Lugano | 2021/03/21 11:50 | Tim Van Rijthoven v Erler, Alexander | 7-6,6-0 |
| ITF - M25 Trimbach | 2021/03/12 09:55 | Elmar Ejupovic v Erler, Alexander | 7-6,6-7,6-3 |
| ITF - M25 Trimbach | 2021/03/11 10:00 | Quentin Folliot v Erler, Alexander | 4-6,3-6 |