Stadium: Sportna Dvorana Golovec Round: 54 Ground: Clay
| ITF M25 Santa Margherita | 2023/10/08 08:30 | Marcel Marlon Sudzum v Toby Martin | 1-6,0-6 |
| ITF M25 Santa Margherita | 2023/09/17 08:30 | Marcel Marlon Sudzum v Marco Dessi | 1-6,3-6 |
| ITF M15 Saarlouis | 2023/06/18 09:00 | Marcel Marlon Sudzum v Collin Altamirano | 1-6,2-6 |
| ITF M25 Risskov/Aarhus | 2023/06/11 12:50 | Oren Vasser v Marcel Marlon Sudzum | 6-2,6-1 |
| ITF M25 Most | 2023/05/21 08:00 | Lukas Velik v Marcel Marlon Sudzum | 6-4,6-1 |
| ITF M25 Santa Margherita | 2023/04/30 08:00 | Leonardo Catani v Marcel Marlon Sudzum | 6-3,6-1 |
| ITF M25 Santa Margherita | 2023/04/23 11:00 | Mikalai Haliak v Marcel Marlon Sudzum | 6-4,6-1 |
| ITF M25 Santa Margherita | 2023/04/16 08:30 | Giannicola Misasi v Marcel Marlon Sudzum | 6-0,6-1 |
| ITF M15 Boca Raton | 2023/11/17 14:00 | Noah Schlagenhauf v Alvin N Tudorica | 3-6,3-6 |
| ITF M15 Boca Raton | 2023/11/16 15:00 | Mikel Anderson v Noah Schlagenhauf | 2-6,5-7 |
| ITF M15 Boca Raton | 2023/11/14 14:00 | Brian Cernoch v Noah Schlagenhauf | 2-6,7-5,10-12 |
| ITF M15 Fayetteville | 2023/10/30 15:00 | Noah Schlagenhauf v Pablo Carretero | 3-6,5-7 |
| ITF M25 Ystad | 2023/08/16 10:20 | Noah Schlagenhauf v Karl Friberg | 2-6,0-6 |
| ITF M25 Ystad | 2023/08/15 08:45 | Noah Schlagenhauf v Eldin Nokic | 7-5,6-2 |
| ITF M25 Ystad | 2023/08/14 13:05 | Noah Schlagenhauf v Samuel Rovai | 6-0,6-3 |
| ITF M15 Metzingen | 2023/07/23 12:00 | Gian Luca Tanner v Noah Schlagenhauf | 2-6,6-1,10-3 |