Stadium: Court 1 Round: 25 Ground: Clay
| ITF M25 Telfs | 2023/07/18 10:00 | Peter Heller v Niklas Schell | 6-3,6-1 |
| Challenger Braunschweig | 2023/07/09 11:00 | Niklas Schell v Carlos Taberner | 4-6,4-6 |
| ITF M15 Kamen | 2023/06/29 11:30 | Niklas Schell v Hazem Naw | 1-6,0-6 |
| ITF M15 Kamen | 2023/06/28 10:25 | Niklas Schell v Robin Sanz | 6-4,6-7,6-3 |
| ITF M15 Duffel | 2023/06/14 09:50 | Ryan Nijboer v Niklas Schell | 6-7,6-2,6-4 |
| ITF M25 Kursumlijska Banja | 2023/06/07 18:00 | Lautaro Midon v Niklas Schell | 6-3,6-4 |
| ITF M15 Kursumlijska Banja | 2023/06/01 08:55 | Martyn Pawelski v Niklas Schell | 6-3,6-3 |
| ITF M15 Kursumlijska Banja | 2023/05/31 07:00 | Niklas Schell v Johan A Rodriguez Rodriguez | 6-7,6-2,6-3 |
| ITF M15 Uslar | 2023/07/19 10:00 | Jannik Opitz v Esteban Bruna | 2-6,4-6 |
| Challenger Braunschweig | 2023/07/09 12:40 | Daniel Masur v Jannik Opitz | 7-5,6-4 |
| ITF M25 Nussloch | 2023/01/27 13:55 | Hazem Naw v Jannik Opitz | 6-4,1-6,7-6 |
| ITF M25 Nussloch | 2023/01/26 12:15 | Jannik Opitz v Dominik Recek | 6-7,7-6,7-6 |
| ITF M25 Nussloch | 2023/01/25 15:05 | Tim Sandkaulen v Jannik Opitz | 6-7,1-6 |
| ITF M25 Nussloch | 2023/01/23 15:50 | Lukas Pokorny v Jannik Opitz | 2-6,6-7 |
| ITF M25 Nussloch | 2023/01/23 09:00 | Niklas Koch v Jannik Opitz | 3-6,4-6 |
| ITF M25 Veigy-Foncenex | 2023/01/10 10:15 | Jannik Opitz v Matthias Bachinger | 6-7,5-7 |