Stadium: Court 6 Round: 62 Ground: Hardcourt outdoor
| ITF M25 Jablonec Nad Nisou | 2020/09/20 12:00 | Brutscher, Tobias v Zukas, Matias | 2-6,1-6 |
| ITF M25 Klosters | 2020/09/14 08:35 | Staeheli, Luca v Brutscher, Tobias | 6-2,6-0 |
| Vogau, Singles Qualifying M-ITF-AUT-04A | 2020/08/16 09:30 | Brutscher, Tobias v Neil Oberleitner | 2-6,1-6 |
| ITF - M25 Trente | 2020/02/24 10:15 | Brutscher, Tobias v Gian Marco Ortenzi | 0-6,1-6 |
| ITF - M15 Oberhaching | 2020/02/16 08:00 | Brutscher, Tobias v Hazem Naw | 3-6,5-7 |
| ITF - M15 Antalya | 2020/01/13 07:00 | Mert Alkaya v Brutscher, Tobias | 6-4,6-1 |
| ITF - M15 Manacor | 2020/01/05 10:30 | Terczynski, Mateusz v Brutscher, Tobias | 6-2,6-1 |
| Sarreguemines, Singles M-ITF-FRA-22A | 2019/11/17 13:20 | Boris Fassbender v Brutscher, Tobias | 6-4,6-2 |
| ITF M25 Austin | 2021/11/17 20:00 | Eliot Spizzirri v Frantzen, Constantin | 6-3,6-3 |
| ITF M25 Austin | 2021/11/16 16:50 | Frantzen, Constantin v Miguel Angel Cabrera | 6-2,6-4 |
| ITF M25 Austin | 2021/11/15 18:00 | Arimilli, Nevin v Frantzen, Constantin | 4-6,4-6 |
| ITF M25 Harlingen | 2021/11/09 15:00 | Noah Schachter v Frantzen, Constantin | 7-6,6-2 |
| Fayetteville, AR, Singles Qualifying, M-ITF-USA-31 | 2021/11/02 14:00 | Frantzen, Constantin v Mathieu Scaglia | 4-6,5-7 |
| Fayetteville, AR, Singles Qualifying, M-ITF-USA-31 | 2021/11/01 14:00 | Baker, Blu v Frantzen, Constantin | 7-6,3-6,5-10 |
| ITF M15 Lubbock | 2021/09/26 15:00 | Frantzen, Constantin v Lah, Sven | 3-6,6-1,4-10 |
| Fort Worth, Singles Qualifying M-ITF-USA-42A | 2019/10/21 15:00 | Frantzen, Constantin v Papa, Spencer | 5-7,3-6 |