Stadium: MTA 02 Round: 26 Ground: Clay
| ITF M25 Telfs | 2023/07/18 10:00 | Peter Heller v Niklas Schell | 6-3,6-1 |
| ITF M25 Tavira | 2023/10/18 10:30 | Niklas Schell v Andrea Guerrieri | 3-6,2-6 |
| Challenger Mouilleron le Captif | 2023/10/01 12:00 | Gabriel Debru v Niklas Schell | 6-4,6-1 |
| ITF M15 Forbach | 2023/09/27 08:00 | Niklas Schell v Tom Gentzsch | 6-7,6-7 |
| ITF M15 Monastir | 2023/09/13 12:10 | Aleksandr Lobanov v Niklas Schell | 4-6,7-6,6-2 |
| ITF M15 Budapest | 2023/08/29 12:00 | Niklas Schell v Giles Hussey | 4-6,3-6 |
| ITF M25 Muttenz | 2023/08/16 08:00 | Niklas Schell v Nicolas Parizzia | 4-6,2-6 |
| ITF M15 Frankfurt Am Main | 2023/08/10 09:00 | Niklas Schell v Andrey Chepelev | 3-6,6-7 |
| ITF M15 Frankfurt Am Main | 2023/08/08 10:45 | Niklas Schell v Vincent Marysko | 6-4,6-4 |
| ITF M15 Bad Waltersdorf | 2023/10/04 09:45 | Jan Kupcic v Peter Heller | 6-3,6-4 |
| ITF M25 Sabadell | 2023/09/26 10:20 | Imanol L Morillo v Peter Heller | 7-6,2-6,6-4 |
| ITF M25 Madrid | 2023/09/17 11:00 | Aidan Mchugh v Peter Heller | 6-4,7-5 |
| ITF M25 Madrid | 2023/09/16 07:55 | Miguel Damas v Peter Heller | 6-2,6-7,5-7 |
| ITF M25 Madrid | 2023/09/15 09:00 | Peter Heller v Clement Chidekh | 6-2,6-3 |
| ITF M25 Madrid | 2023/09/14 11:45 | Peter Heller v Alberto Romero De Avila Senise | 6-2,6-1 |
| ITF M25 Madrid | 2023/09/12 11:20 | Peter Heller v Martin Landaluce | 6-7,6-4,6-4 |
| ITF M15 Vienna | 2023/09/03 08:30 | Milos Karol v Peter Heller | 6-7,2-6 |