Stadium: Court 1 Round: 25 Ground: Hardcourt outdoor
| ITF - M15 Monastir | 2020/09/15 09:30 | Kotzen, Alexander v Benedikt Henning | 6-1,6-3 |
| ITF - M15 Monastir | 2020/09/13 10:30 | Fellin, Pietro Orlando v Kotzen, Alexander | 3-6,6-7 |
| ITF Tunisia F45 | 2018/12/16 09:00 | Flavio Cobolli v Kotzen, Alexander | 6-4,7-6 |
| ITF Tunisia F45 | 2018/12/15 10:00 | Kotzen, Alexander v Ben Fraj, Skander | 6-0,6-0 |
| ITF Turkey F39 | 2018/12/02 06:30 | Mancineiras Cornella, Oscar v Kotzen, Alexander | 6-2,6-4 |
| Tunisia F40, Singles | 2018/11/11 09:30 | Brunetti, Lorenzo v Kotzen, Alexander | 6-3,6-1 |
| Tunisia F40, Singles | 2018/11/10 10:00 | Ben Brahim, Zakaria v Kotzen, Alexander | 6-7,1-6 |
| ITF Tunisia F39 | 2018/11/05 08:00 | Johannson-Holm, Jakob v Kotzen, Alexander | 6-2,6-2 |
| Kitzbuhel, Austria | 2020/09/07 11:00 | Egor Gerasimov v Erler, Alexander | 7-6,6-3 |
| ITF M15 Caslano | 2020/08/31 08:55 | Erler, Alexander v Yannik Steinegger | 4-6,3-6 |
| ITF M15 Anif | 2020/08/25 13:25 | Erler, Alexander v Balzerani, Riccardo | 3-6,0-6 |
| Vogau, Singles Qualifying M-ITF-AUT-04A | 2020/08/19 13:00 | Gijs Brouwer v Erler, Alexander | 6-1,6-0 |
| Vogau, Singles Qualifying M-ITF-AUT-04A | 2020/08/17 11:30 | Erler, Alexander v Prechtel, Sebastian | 6-4,4-6,10-8 |
| Vogau, Singles Qualifying M-ITF-AUT-04A | 2020/08/17 09:00 | Erler, Alexander v Daniil Glinka | 6-1,7-6 |
| Vogau, Singles Qualifying M-ITF-AUT-04A | 2020/08/16 07:30 | Erler, Alexander v Arh, Anze | 6-3,6-1 |
| Austrian Tennis Championship | 2020/07/21 15:40 | Erler, Alexander v Bachmaier, Philip | 6-3,6-3 |