Stadium: Court 1 Round: 25 Ground: Clay
| ITF - M15 Frankfurt Am Main | 2023/08/07 15:30 | Mariano Dedura-Palomero v Rostislav Galfinger | 3-6,1-6 |
| ITF - M15 Metzingen | 2023/07/26 14:45 | Rostislav Galfinger v Aleksandre Metreveli | 5-7,6-2,4-6 |
| ITF - M15 Metzingen | 2023/07/24 12:00 | Karlo Cubelic v Rostislav Galfinger | 2-6,4-6 |
| ITF - M15 Metzingen | 2023/07/23 07:30 | Marvin Schaber v Rostislav Galfinger | 6-7,3-6 |
| ITF - M15 Uslar | 2023/07/19 16:50 | Rostislav Galfinger v Christoph Negritu | 2-6,0-6 |
| ITF - M15 Uslar | 2023/07/17 13:00 | Aaron James Williams v Rostislav Galfinger | 6-7,2-6 |
| ITF - M15 Tehran | 2023/06/15 06:30 | Denis Klok v Rostislav Galfinger | 6-1,6-2 |
| ITF - M15 Tehran | 2023/06/14 06:30 | Rostislav Galfinger v Jagmeet Singh | 6-1,6-2 |
| ITF M25 - Wetzlar | 2023/08/06 10:00 | Sebastian Fanselow v Tristan Lamasine | 3-6,1-6 |
| ITF M25 - Wetzlar | 2023/08/05 12:30 | Orlando Luz v Sebastian Fanselow | 6-7,2-6 |
| ITF M25 - Wetzlar | 2023/08/04 11:10 | Sebastian Fanselow v Milan Welte | 7-5,4-6,6-3 |
| ITF M25 - Wetzlar | 2023/08/04 08:00 | Sebastian Fanselow v Niklas Schell | 6-4,6-3 |
| ITF M25 - Wetzlar | 2023/08/03 09:35 | Sebastian Fanselow v Yan Sabanin | 6-3,6-4 |
| Challenger - Karlsruhe | 2023/07/03 10:35 | Denis Yevseyev v Sebastian Fanselow | 7-5,7-6 |
| Challenger - Karlsruhe | 2023/07/02 14:15 | Andrew Paulson v Sebastian Fanselow | 2-6,5-7 |
| ITF M25 - Arlon | 2023/06/29 12:00 | Sandro Kopp v Sebastian Fanselow | 6-4,4-6,7-6 |