| Lisbon, Portugal | 09/28 09:00 | 25 | [423] Sebastian Fanselow v Nikola Milojevic [141] | 4-6,4-6 | |
| Lisbon, Portugal | 09/27 09:00 | 19 | [442] Jacopo Berrettini v Sebastian Fanselow [423] | 6-4,5-7,2-6 | |
| Lisbon, Portugal | 09/26 09:00 | 14 | [239] Bortolotti, Marco v Sebastian Fanselow [421] | 2-6,2-6 | |
| Challenger Braga | 09/20 09:00 | 19 | [350] Nikolas S Izquierdo v Sebastian Fanselow [421] | 6-4,1-6,6-3 | |
| Challenger Braga | 09/19 10:25 | 14 | Jaime Faria v Sebastian Fanselow | 0-6,2-6 | |
| ITF M25 Sintra | 09/15 15:35 | 25 | Soriano Barrera, Adria v Sebastian Fanselow | 6-4,6-4 | |
| ITF M25 Sintra | 09/08 10:40 | 25 | Luca Potenza v Sebastian Fanselow | 6-4,6-4 | |
| ITF M25 Bagneres-De-Bigorre | 09/01 07:30 | 25 | Millen Hurrion v Sebastian Fanselow | 2-6,7-5,7-6 | |
| Poznan, Poland | 07/25 10:30 | 14 | [414] Sebastian Fanselow v Lucas Gerch [444] | 2-6,5-7 | |
| Poznan, Poland | 07/25 10:20 | 14 | Sebastian Fanselow v Corentin Denolly | Cancelled | |
| ITF M25 Bourg-en-Bresse | 06/29 13:00 | 25 | [373] Viktor Durasovic v Sebastian Fanselow [402] | 1-6,7-6,6-2 | |
| Milan, Italy | 06/20 13:15 | 14 | [392] Sebastian Fanselow v Camilo Ugo Carabelli [300] | 6-3,2-6,2-6 | |
| Forli 6, Italy | 06/15 09:30 | 25 | [392] Sebastian Fanselow v Camilo Ugo Carabelli [300] | 2-6,2-6 | |
| Forli 6, Italy | 06/14 09:30 | 19 | [392] Sebastian Fanselow v Vanni, Luca [433] | 2-6,6-2,7-5 | |
| Forli 6, Italy | 06/13 12:20 | 14 | Sebastian Fanselow v Antoine Bellier | 6-3,6-4 | |
| Orlando, USA | 06/06 14:00 | 14 | [340] Thiago Agustin Tirante v Sebastian Fanselow [402] | 6-2,3-6,6-4 | |
| Challenger - Little Rock | 05/31 15:00 | 19 | [462] Alexis Galarneau v Sebastian Fanselow [402] | 3-6,6-3,6-4 | |
| Challenger - Little Rock | 05/30 15:00 | 14 | [476] Pervolarakis, Michail v Sebastian Fanselow [399] | 4-6,5-7 | |
| ITF M15 Troisdorf | 05/15 13:25 | 28 | [448] Elmar Ejupovic v Sebastian Fanselow [408] | 7-6,6-4 | |
| ITF M15 Troisdorf | 05/14 16:10 | 27 | [475] Louis Wessels v Sebastian Fanselow [408] | 4-6,5-7 | |
| ITF M15 Troisdorf | 05/13 13:25 | 26 | Netuschil, Marvin v Sebastian Fanselow | 2-6,1-6 | |
| ITF M15 Troisdorf | 05/11 11:00 | 25 | Dietel, Maximilian v Sebastian Fanselow | 0-6,1-6 | |
| ITF M15 Majadahonda | 05/06 10:40 | 26 | [378] Matteo Martineau v Sebastian Fanselow [408] | 6-1,7-6 | |
| ITF M15 Majadahonda | 05/05 09:00 | 25 | Ignacio B Alia v Sebastian Fanselow | 2-6,0-6 | |
| ITF - M25 Angers | 04/22 13:30 | 26 | Lopez San Martin, Alvaro v Sebastian Fanselow | 2-6,6-1,6-4 | |
| ITF - M25 Angers | 04/21 15:05 | 25 | [410] Sebastian Fanselow v Nikolas S Izquierdo [343] | 6-2,7-5 | |
| ITF - M25 La Nucia | 03/19 14:05 | 26 | [436] Sebastian Fanselow v Raul Brancaccio [361] | 6-7,0-6 | |
| ITF - M25 La Nucia | 03/17 09:00 | 25 | Sebastian Fanselow v Toledo Bague, Pol | Retired | |
| ITF - M25 Vale Do Lobo | 03/14 11:30 | 29 | [321] Kaichi Uchida v Sebastian Fanselow [435] | 5-7,7-6,7-6 | |
| ITF - M25 Vale Do Lobo | 03/13 13:20 | 28 | Sebastian Fanselow v Wang, Tak Khunn | 6-1,6-3 |