Stadium: Court 1 Round: 25 Ground: Hardcourt indoor
| Challenger L'Aquila | 2018/06/19 10:00 | Johannes Haerteis v Riccardo Balzerani | 6-4,2-6,4-6 |
| Challenger Prostejov | 2021/06/15 08:30 | Johannes Haerteis v Federico Coria | 1-6,0-6 |
| Challenger Prostejov | 2021/06/14 08:30 | Johannes Haerteis v David Poljak | 5-7,3-6 |
| Challenger Prostejov | 2021/06/13 09:00 | Johannes Haerteis v Jakub Nicod | 6-3,3-6,6-3 |
| Challenger Bratislava | 2021/06/06 14:15 | Skander Mansouri v Johannes Haerteis | 6-3,7-5 |
| Challenger Oeiras | 2021/05/25 14:00 | Johannes Haerteis v Filip Cristian Jianu | 3-6,0-6 |
| Challenger Ortisei | 2020/11/19 10:00 | Johannes Haerteis v Ilya Ivashka | 6-7,3-6 |
| Challenger Ortisei | 2020/11/17 09:00 | Daniel Masur v Johannes Haerteis | 3-6,7-6,3-6 |
| Challenger Ortisei | 2020/11/15 10:00 | Alexey Vatutin v Johannes Haerteis | 3-6,6-3,3-6 |
| ITF M15 Antalya | 2021/06/11 07:00 | Martin Krumich v Riccardo Balzerani | 6-2,7-5 |
| ITF M15 Antalya | 2021/06/10 07:00 | Marsel Ilhan v Riccardo Balzerani | 7-6,6-7,3-6 |
| ITF M15 Antalya | 2021/06/08 07:00 | Bora Sengul v Riccardo Balzerani | 4-6,4-6 |
| ITF M15 Antalya | 2021/05/05 10:10 | Riccardo Balzerani v Sandro Ehrat | 2-6,6-7 |
| ITF M15 Antalya | 2021/04/28 07:00 | Riccardo Balzerani v Peter Heller | 1-6,4-6 |
| ITF M15 Monastir | 2021/04/08 11:30 | Riccardo Balzerani v Evan Zhu | 0-6,7-6,3-6 |
| ITF M15 Monastir | 2021/04/06 09:00 | Riccardo Balzerani v Thomas George Brun | 6-2,6-2 |
| ITF M15 Monastir | 2021/03/31 11:00 | Riccardo Balzerani v Alex Barrena | 4-6,6-2,1-6 |