Stadium: Court 1 Round: 29 Ground: Clay
| ITF M25 Meerbusch | 2021/04/17 12:55 | Elmar Ejupovic v Erler, Alexander | 3-6,4-6 |
| 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 | van Rijthoven, Tim 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 Meerbusch | 2021/04/17 11:00 | Arthur Cazaux v David Pichler | 6-4,6-4 |
| ITF M25 Meerbusch | 2021/04/16 09:55 | Arthur Cazaux v Michael Vrbensky | 6-2,6-3 |
| ITF M25 Meerbusch | 2021/04/13 15:10 | Arthur Cazaux v Crepatte, Baptiste | 6-1,6-1 |
| ITF M25 Biel | 2021/04/02 08:55 | Arthur Cazaux v van Rijthoven, Tim | 6-7,3-6 |
| ITF M25 Biel | 2021/04/01 08:00 | Jerome Kym v Arthur Cazaux | 6-7,3-6 |
| ITF M25 Biel | 2021/03/31 11:55 | Arthur Cazaux v Yuta Shimizu | 6-7,6-2,7-5 |
| ITF M25 Biel | 2021/03/30 09:55 | Vanni, Luca v Arthur Cazaux | 4-6,2-6 |
| ITF M25 Biel | 2021/03/29 09:45 | Martinez, Mirko v Arthur Cazaux | 3-6,2-6 |