Round: 44
| ITF M25 Las Vegas | 2020/03/07 02:30 | Johannes Haerteis v Petros Chrysochos | 2-6,7-5,4-6 |
| ITF M25 Las Vegas | 2020/03/05 19:45 | Johannes Haerteis v Alex Blumenberg | 7-6,6-1 |
| 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 |