Stadium: Court 1 Round: 25 Ground: Hardcourt indoor
| L'Aquila, Italie | 2018/06/19 10:00 | Haerteis, Johannes v Balzerani, Riccardo | 6-4,2-6,4-6 |
| ITF M25 Jonkoping | 2021/09/20 10:45 | Bergevi, Filip v Haerteis, Johannes | 6-4,7-6 |
| ITF M25 Plaisir | 2021/09/15 11:45 | Haerteis, Johannes v Mitjana, Leny | 4-6,6-7 |
| Challenger Tulln | 2021/09/06 13:00 | Haerteis, Johannes v Horansky, Filip | 6-4,4-6,3-6 |
| Challenger Mallorca | 2021/09/01 18:40 | Haerteis, Johannes v Lacko, Lukas | 2-6,3-6 |
| Challenger Mallorca | 2021/08/31 08:00 | Nicolas Moreno De Alboran v Haerteis, Johannes | 3-6,6-4,4-6 |
| Challenger Mallorca | 2021/08/30 08:00 | Martos Gornes, Sergio v Haerteis, Johannes | 1-6,1-6 |
| Challenger - Prague | 2021/08/24 10:15 | Haerteis, Johannes v Alex Rybakov | 4-6,2-6 |
| Luedenscheid, Germany | 2021/08/15 09:30 | Bogdan Bobrov v Haerteis, Johannes | 1-6,6-4,6-3 |
| ITF M25 Skopje | 2021/10/01 13:30 | Balzerani, Riccardo v Henri Squire | 2-6,4-6 |
| ITF M25 Skopje | 2021/10/01 10:05 | Balzerani, Riccardo v Micov, Stefan | 7-5,6-1 |
| ITF M25 Skopje | 2021/09/29 07:55 | Balzerani, Riccardo v Lorenzo Vatteroni | 6-3,6-2 |
| Pirot, Singles M-ITF-SRB-05A | 2021/09/22 08:00 | Luigi Sorrentino v Balzerani, Riccardo | 6-1,7-5 |
| ITF M15 Ulcinj | 2021/09/08 08:00 | Balzerani, Riccardo v Kijametovic, Aziz | 5-7,2-6 |
| ITF M15 Allershausen | 2021/08/31 13:15 | Christoph Negritu v Balzerani, Riccardo | 6-3,6-2 |
| ITF M25 Lesa | 2021/08/26 13:50 | Federico Arnaboldi v Balzerani, Riccardo | 6-3,7-5 |
| ITF M25 Lesa | 2021/08/25 19:00 | Marcello Serafini v Balzerani, Riccardo | 4-6,3-6 |