Stadium: Court 5 Round: 26 Ground: Hardcourt outdoor
| Challenger Poznan | 2021/07/25 10:30 | Sebastian Fanselow v Lucas Gerch | 2-6,5-7 |
| ITF M25 Bourg-en-Bresse | 2021/06/29 13:00 | Viktor Durasovic v Sebastian Fanselow | 1-6,7-6,6-2 |
| Challenger Milan | 2021/06/20 13:15 | Sebastian Fanselow v Camilo Ugo Carabelli | 6-3,2-6,2-6 |
| Challenger Forli | 2021/06/15 09:30 | Sebastian Fanselow v Camilo Ugo Carabelli | 2-6,2-6 |
| Challenger Forli | 2021/06/14 09:30 | Sebastian Fanselow v Luca Vanni | 2-6,6-2,7-5 |
| Challenger Forli | 2021/06/13 12:20 | Sebastian Fanselow v Antoine Bellier | 6-3,6-4 |
| Challenger Orlando | 2021/06/06 14:00 | Thiago Agustin Tirante v Sebastian Fanselow | 6-2,3-6,6-4 |
| Challenger Little Rock | 2021/05/31 15:00 | Alexis Galarneau v Sebastian Fanselow | 3-6,6-3,6-4 |
| Challenger Salzburg | 2021/07/05 13:00 | Roberto Carballes Baena v Maximilian Neuchrist | 6-4,4-6,6-4 |
| Austrian Tennis Championship | 2021/07/03 09:30 | Sebastian Ofner v Maximilian Neuchrist | 6-4,6-4 |
| Austrian Tennis Championship | 2021/07/02 11:00 | Filip Misolic v Maximilian Neuchrist | 4-6,1-5 |
| Austrian Tennis Championship | 2021/07/01 13:00 | Maximilian Neuchrist v Lucas Miedler | 6-2,6-2 |
| ITF M25 Klosters | 2021/06/23 10:50 | Maximilian Neuchrist v Sandro Ehrat | 4-6,4-6 |
| ITF M15 Brcko | 2021/05/21 13:20 | Maximilian Neuchrist v Joao Lucas Reis da Silva | 4-6,4-6 |
| ITF M15 Brcko | 2021/05/19 08:30 | Maximilian Neuchrist v Lazar Vojinovic | 6-3,6-4 |
| ITF M15 Prijedor | 2021/05/11 10:00 | Danylo Kalenichenko v Maximilian Neuchrist | 6-2,3-6,6-3 |