Stadium: Court 2 Round: 62 Ground: Clay
| ITF M25 Sierre | 2021/08/29 10:10 | Manfredi Graziani v Marcel Marlon Sudzum | 6-4,6-3 |
| ITF M25 Koksijde | 2021/08/17 15:25 | Gauthier Onclin v Marcel Marlon Sudzum | 6-1,7-6 |
| ITF M25 Koksijde | 2021/08/16 08:00 | Idriss Haddouch v Marcel Marlon Sudzum | 2-6,5-7 |
| ITF M25 Koksijde | 2021/08/15 10:00 | Marcel Hornung v Marcel Marlon Sudzum | 4-6,6-1,9-11 |
| ITF M15 Frederiksberg | 2021/08/01 10:00 | Leonardo Catani v Marcel Marlon Sudzum | 7-6,6-2 |
| ITF M15 Esch/Alzette | 2021/07/18 08:00 | Raphael Collignon v Marcel Marlon Sudzum | 6-4,6-4 |
| ITF M25 Bourg-en-Bresse | 2021/06/27 12:30 | Marcel Marlon Sudzum v Adan Freire Da Silva | 6-7,0-6 |
| ITF M25 Alkmaar | 2021/06/20 17:00 | Marcel Marlon Sudzum v Yan Sabanin | 1-6,2-6 |
| ITF M15 Sozopol | 2021/09/12 10:00 | Dean Thurner v Caspar Schuetze | 0-6,2-6 |
| ITF M25 Ricany | 2021/08/29 09:00 | Dean Thurner v Matyas Cerny | 0-6,0-6 |
| ITF M25 Kottingbrunn | 2021/07/18 07:30 | Dean Thurner v Danijel Lazic | 2-6,6-7 |
| ITF M25 Ajaccio | 2021/07/04 07:00 | Simone Agostini v Dean Thurner | 6-4,6-1 |
| ITF M25 Most | 2021/05/24 09:00 | Dean Thurner v Hasan Ibrahim | 0-6,1-6 |
| ITF M25 Most | 2021/05/23 14:00 | Dean Thurner v Tomas Krcma | 3-6,7-5,10-6 |
| ITF M15 Monastir | 2021/03/14 10:00 | Dean Thurner v Tobias Franco | 4-6,3-6 |
| ITF M15 Antalya | 2020/12/15 11:00 | Burak Bilgin v Dean Thurner | 7-6,5-7,13-11 |