Stadium: Court12 Round: 26 Ground: Hardcourt outdoor
| ITF M15 Prague | 2019/11/06 14:40 | Oleksii Krutykh v Johannes Haerteis | 4-6,7-6,6-2 |
| Challenger Eckental | 2019/10/29 09:00 | John-Patrick Smith v Johannes Haerteis | 7-6,6-7,7-6 |
| Challenger Hamburg | 2019/10/22 08:00 | Cem Ilkel v Johannes Haerteis | 7-5,6-1 |
| Challenger Ismaning | 2019/10/17 11:00 | Zdenek Kolar v Johannes Haerteis | 6-7,6-7 |
| Challenger Ismaning | 2019/10/16 11:50 | Johannes Haerteis v Robin Haase | 6-4,6-7,7-6 |
| Challenger Ismaning | 2019/10/14 15:10 | Johannes Haerteis v Maximilian Neuchrist | 6-4,6-4 |
| Challenger Nur-Sultan 2 | 2019/10/01 04:00 | Fabien Reboul v Johannes Haerteis | 6-4,6-7,6-3 |
| Challenger Glasgow | 2019/09/18 15:05 | Johannes Haerteis v Tobias Kamke | 3-6,4-6 |
| ITF M15 Sao Paulo | 2019/10/16 14:00 | Matias Zukas v Alex Blumenberg | 6-3,6-2 |
| ITF M15 Santa Tecla | 2019/10/04 15:00 | Jose Olivares v Alex Blumenberg | 6-3,7-5 |
| ITF M15 Santa Tecla | 2019/10/02 23:45 | Enrique Bogo v Alex Blumenberg | 6-7,4-6 |
| ITF M15 Santa Tecla | 2019/10/01 15:00 | Caio Gruber v Alex Blumenberg | 2-6,2-6 |
| ITF M15 Fayetteville | 2019/09/18 14:00 | Ivailo Keremedchiev v Alex Blumenberg | 7-6,6-2 |
| ITF M15 Champaign | 2019/09/11 16:00 | Kareem Allaf v Alex Blumenberg | 7-6,4-6,6-3 |
| ITF M15 Lambare | 2019/08/22 17:40 | Gonzalo Villanueva v Alex Blumenberg | 6-3,6-3 |
| ITF M15 Lambare | 2019/08/21 20:15 | Alex Blumenberg v Fernando Yamacita | 7-5,6-3 |