Stadium: CC Round: 26 Ground: Clay
| ITF M25 - Trier | 2021/08/25 09:00 | Marvin Moeller v Leopold Zima | 6-1,7-5 |
| Challenger - Lüdenscheid | 2021/08/17 15:35 | Matteo Martineau v Marvin Moeller | 6-0,6-2 |
| Challenger - Meerbusch | 2021/08/09 09:30 | Jesper De Jong v Marvin Moeller | 6-1,6-4 |
| Challenger - Meerbusch | 2021/08/08 09:10 | Marvin Moeller v Benjamin Hassan | 5-7,7-5,6-3 |
| ITF M25 - Wetzlar | 2021/08/04 08:00 | Marvin Moeller v Peter Heller | 2-6,3-6 |
| Challenger - Braunschweig | 2021/07/10 09:00 | Daniel Altmaier v Marvin Moeller | 7-5,6-0 |
| Challenger - Braunschweig | 2021/07/08 13:00 | Marvin Moeller v Benjamin Hassan | 6-4,6-2 |
| Challenger - Braunschweig | 2021/07/07 09:30 | Sumit Nagal v Marvin Moeller | 3-6,6-1,2-6 |
| ITF M25 - Trier | 2021/08/24 09:55 | Manish Sureshkumar v Marlon Vankan | 6-7,1-6 |
| ITF M15 - Cairo | 2021/08/04 13:30 | Keisuke Saitoh v Marlon Vankan | 6-4,7-5 |
| ITF M15 - Cairo | 2021/07/28 08:00 | Alejo Lorenzo Lingua Lavallen v Marlon Vankan | 6-3,6-0 |
| ITF M15 - Cairo | 2021/07/27 08:00 | Marlon Vankan v Menelaos Efstathiou | 6-2,2-6,11-9 |
| ITF M15 - Cairo | 2021/07/26 09:00 | Marlon Vankan v Tomohiro Masabayashi | 6-4,6-2 |
| ITF M15 - Cairo | 2021/07/25 11:00 | Marlon Vankan v Tommaso Vescovi | 6-1,6-2 |
| ITF M15 - Esch/Alzette | 2021/07/21 11:50 | Marlon Vankan v Mick Veldheer | 3-6,6-0,6-7 |
| ITF M15 - Esch/Alzette | 2021/07/20 15:45 | Marlon Vankan v Alex Knaff | 6-4,6-4 |