| Exo Tennis Germany Series | 2020/05/31 09:35 | Gelhardt, Luca v Haerteis, Johannes | 2-6,2-6 |
| DTB German Pro Series | 2020/06/26 12:00 | Max Hans Rehberg v Haerteis, Johannes | 3-6,2-6 |
| DTB German Pro Series | 2020/06/25 13:35 | Daniel Masur v Haerteis, Johannes | 6-7,6-1,5-7 |
| DTB German Pro Series | 2020/06/24 14:10 | Haerteis, Johannes v Max Hans Rehberg | 3-6,2-6 |
| DTB German Pro Series | 2020/06/23 12:00 | Stebe, Cedrik-Marcel v Haerteis, Johannes | 6-4,6-3 |
| DTB German Pro Series | 2020/06/14 13:40 | Haerteis, Johannes v Torebko, Peter | 3-6,3-6 |
| DTB German Pro Series | 2020/06/13 15:30 | Haerteis, Johannes v Sebastian Fanselow | 6-4,6-4 |
| DTB German Pro Series | 2020/06/12 14:45 | Haerteis, Johannes v Christoph Negritu | 7-6,3-6,6-2 |
| DTB German Pro Series | 2020/06/11 14:35 | Haerteis, Johannes v Mika Lipp | 6-0,6-0 |
| Exo Tennis Germany Series | 2020/07/18 08:30 | Sebastian Fanselow v Gelhardt, Luca | 3-6,4-6 |
| Exo Tennis Germany Series | 2020/07/11 09:30 | Gelhardt, Luca v Puetz, Tim | 3-6,2-6 |
| Exo Tennis Germany Series | 2020/06/14 11:05 | Gelhardt, Luca v Jan Choinski | 6-3,4-6,2-6 |
| Exo Tennis Germany Series | 2020/06/13 08:00 | Hazem Naw v Gelhardt, Luca | 3-6,7-6,2-6 |
| Exo Tennis Germany Series | 2020/06/12 08:00 | Gelhardt, Luca v Puetz, Tim | 2-6,2-6 |
| Exo Tennis Germany Series | 2020/06/11 09:30 | Gelhardt, Luca v Schmitz, Constantin | 3-6,6-7 |
| Exo Tennis Germany Series | 2020/06/10 08:00 | Benjamin Hassan v Gelhardt, Luca | 6-3,6-4 |
| Exo Tennis Germany Series | 2020/06/07 08:00 | Born, Yannick Stephan v Gelhardt, Luca | 3-6,5-7 |