Stadium: Court 2 Round: 25 Ground: Carpet indoor
| ITF M15 - Forbach | 2020/09/28 15:45 | Kai Lemstra v Niklas Schell | 6-4,7-6 |
| ITF M15 - Anif | 2020/08/26 14:40 | Karlis Ozolins v Kai Lemstra | 7-5,6-3 |
| ITF M15 - Anif | 2020/08/24 12:50 | Kai Lemstra v Benedikt Emesz | 6-1,6-2 |
| ITF M15 - Anif | 2020/08/23 12:00 | Kirill Kivattsev v Kai Lemstra | 6-7,3-6 |
| ITF M15 - Sharm El Sheikh | 2020/03/11 11:40 | Francesco Vilardo v Kai Lemstra | 6-4,6-7,7-5 |
| ITF M15 - Trnava | 2020/02/27 12:10 | Kai Lemstra v Aldin Setkic | 3-6,3-6 |
| ITF M15 - Trnava | 2020/02/26 12:10 | Kai Lemstra v Andrej Glvac | 6-4,6-4 |
| ITF M15 - Trnava | 2020/02/25 09:00 | Dominik Recek v Kai Lemstra | 6-7,3-6 |
| ITF - M15 - Monastir | 2020/09/26 08:30 | Alexander Erler v Luca Potenza | 4-6,5-7 |
| ITF - M15 - Monastir | 2020/09/25 08:30 | Jean Thirouin v Alexander Erler | 4-6,4-6 |
| ITF - M15 - Monastir | 2020/09/24 09:40 | Cesar Bourgois v Alexander Erler | 2-6,2-6 |
| ITF - M15 - Monastir | 2020/09/23 10:55 | Kelsey Stevenson v Alexander Erler | 1-6,2-6 |
| ITF - M15 - Monastir | 2020/09/16 11:25 | Alexander Kotzen v Alexander Erler | 3-6,6-2,7-6 |
| ATP Kitzbühel | 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 |