Stadium: Court 2 Round: 25 Ground: Clay
| 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 |
| Challenger - Ortisei | 2020/11/14 09:00 | Johannes Haerteis v Viktor Galovic | 4-6,7-6,6-4 |
| Challenger - Bratislava | 2020/11/08 11:00 | Johannes Haerteis v Julian Lenz | 7-6,4-6,6-7 |
| Challenger - Eckental | 2020/11/04 12:55 | Sebastian Korda v Johannes Haerteis | 6-2,1-6,6-1 |
| Challenger - Eckental | 2020/11/02 18:40 | Yannick Maden v Johannes Haerteis | 2-6,6-4,3-6 |
| Challenger - Eckental | 2020/11/01 13:15 | Lukáš Klein v Johannes Haerteis | 1-6,4-6 |
| Challenger - Oeiras | 2021/05/24 10:00 | Filip Cristian Jianu v Federico Zeballos | 6-4,7-5 |
| Challenger - Oeiras | 2021/05/23 10:00 | Filip Cristian Jianu v Francisco Cabral | 6-7,6-4,6-2 |
| ITF - M25 Vic | 2021/05/19 13:50 | Filip Cristian Jianu v Carlos Lopez Montagud | 6-7,4-6 |
| ITF - M15 - Antalya | 2021/05/07 06:55 | Filip Cristian Jianu v Orlando Luz | 1-6,6-3,3-6 |
| ITF - M15 - Antalya | 2021/05/06 11:10 | Filip Cristian Jianu v Jacopo Berrettini | 6-2,6-4 |
| ITF - M15 - Antalya | 2021/05/04 11:20 | Filip Cristian Jianu v Dali Blanch | 6-2,6-3 |
| Challenger - Tallahassee | 2021/04/23 18:00 | Filip Cristian Jianu v Denis Kudla | 6-7,6-3,5-7 |
| Challenger - Tallahassee | 2021/04/22 16:25 | Filip Cristian Jianu v Joao Menezes | 6-4,6-4 |