| Exo Tennis Germany Series | 2020/05/31 09:35 | Gelhardt, Luca v Haerteis, Johannes | 2-6,2-6 |
| Exo Tennis Germany Series | 2020/05/30 10:15 | Jan Choinski v Haerteis, Johannes | 4-6,1-6 |
| Exo Tennis Germany Series | 2020/05/29 09:30 | Schmitz, Constantin v Haerteis, Johannes | 3-6,7-6,6-2 |
| Exo Tennis Germany Series | 2020/05/28 08:00 | Puetz, Tim v Haerteis, Johannes | 6-4,6-2 |
| Exo Tennis Germany Series | 2020/05/27 11:05 | Florian Broska v Haerteis, Johannes | 1-6,4-6 |
| Exo Tennis Germany Series | 2020/05/17 16:55 | Haerteis, Johannes v JUNAID R. | 3-4,4-0,4-1 |
| Exo Tennis Germany Series | 2020/05/17 07:00 | Haerteis, Johannes v Born, Yannick Stephan | 3-4,3-4 |
| Exo Tennis Germany Series | 2020/05/16 13:00 | Haerteis, Johannes v Schmitz, Constantin | 1-4,2-4 |