Stadium: Court 1 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Monastir | 2020/09/15 09:30 | Alexander Kotzen v Benedikt Henning | 6-1,6-3 |
| ITF M15 Monastir | 2020/09/13 10:30 | Petro Orlando Fellin v Alexander Kotzen | 3-6,6-7 |
| ITF Tunisia F45 | 2018/12/16 09:00 | Flavio Cobolli v Alexander Kotzen | 6-4,7-6 |
| ITF Tunisia F45 | 2018/12/15 10:00 | Alexander Kotzen v Skander Ben Fraj | 6-0,6-0 |
| ITF Turkey F39 | 2018/12/02 06:30 | Oscar M Cornella v Alexander Kotzen | 6-2,6-4 |
| ITF Tunisia F40 | 2018/11/11 09:30 | Lorenzo Brunetti v Alexander Kotzen | 6-3,6-1 |
| ITF Tunisia F40 | 2018/11/10 10:00 | Zakaria B Brahim v Alexander Kotzen | 6-7,1-6 |
| ITF Tunisia F39 | 2018/11/05 08:00 | Jakob Johansson-Holm v Alexander Kotzen | 6-2,6-2 |
| ATP Kitzbuhel | 2020/09/07 11:00 | Egor Gerasimov v Alexander Erler | 7-6,6-3 |
| ITF M15 Caslano | 2020/08/31 08:55 | Alexander Erler v Yannik Steinegger | 4-6,3-6 |
| ITF M15 Anif | 2020/08/25 13:25 | Alexander Erler v Riccardo Balzerani | 3-6,0-6 |
| ITF M25 Vogau | 2020/08/19 13:00 | Gijs Brouwer v Alexander Erler | 6-1,6-0 |
| ITF M25 Vogau | 2020/08/17 11:30 | Alexander Erler v Sebastian Prechtel | 6-4,4-6,10-8 |
| ITF M25 Vogau | 2020/08/17 09:00 | Alexander Erler v Daniil Glinka | 6-1,7-6 |
| ITF M25 Vogau | 2020/08/16 07:30 | Alexander Erler v Anze Arh | 6-3,6-1 |
| Austrian Tennis Championship | 2020/07/21 15:40 | Alexander Erler v Philip Bachmaier | 6-3,6-3 |