Stadion: Court12 Round: 26 Ground: Hardcourt outdoor
| ITF - M25 - Las Vegas | 2020/03/04 19:15 | Johannes Haerteis v Ryan Shane | 6-4,6-4 |
| Challenger - Columbus | 2020/02/27 19:50 | Johannes Haerteis v Cedrik-Marcel Stebe | 4-6,1-6 |
| Challenger - Columbus | 2020/02/26 19:30 | Juan Pablo Ficovich v Johannes Haerteis | 2-6,6-7 |
| Challenger - Columbus | 2020/02/25 15:00 | Alexander Brown v Johannes Haerteis | 3-6,6-7 |
| Challenger - Drummondville | 2020/02/22 17:00 | Maxime Cressy v Johannes Haerteis | 7-6,6-4 |
| Challenger - Drummondville | 2020/02/21 17:40 | Roberto Cid Subervi v Johannes Haerteis | 6-1,4-6,1-6 |
| Challenger - Drummondville | 2020/02/20 17:45 | Johannes Haerteis v Patrik Niklas-Salminen | 7-6,5-7,7-5 |
| Challenger - Drummondville | 2020/02/18 23:05 | Goncalo Oliveira v Johannes Haerteis | 6-7,1-6 |
| ITF - M25 - Las Vegas | 2020/03/04 22:30 | Errol Smith v Alex Blumenberg | 4-6,6-2,4-6 |
| ITF - M15 - Santo Domingo | 2019/12/11 16:00 | Alex Blumenberg v Jose Olivares | 3-6,1-6 |
| ITF - M15 - Santo Domingo | 2019/12/03 17:00 | Ricardo Rodriguez-Pace v Alex Blumenberg | 7-6,6-0 |
| ITF - M15 - East Lansing | 2019/11/20 18:45 | Reese Stalder v Alex Blumenberg | 6-3,6-0 |
| ITF - M25 - Orlando | 2019/11/13 15:00 | Nicolas Alvarez v Alex Blumenberg | 6-3,6-1 |
| ITF - M15 - São 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 |