Stadium: Court 3 Round: 62 Ground: Clay
| ITF M25 Frankfurt am Main | 2021/08/11 11:15 | Adrian Oetzbach v Taiyo Yamanaka | 5-7,5-7 |
| ITF M25 Frankfurt am Main | 2021/08/10 08:25 | Lenny Hampel v Adrian Oetzbach | 2-6,6-0,2-10 |
| ITF M25 Frankfurt am Main | 2021/08/09 09:00 | Adrian Oetzbach v Oscar Moraing | 6-4,3-6,10-6 |
| ITF M15 Frederiksberg | 2021/08/04 12:05 | Jonathan Mridha v Adrian Oetzbach | 6-2,6-3 |
| ITF M15 Frederiksberg | 2021/08/02 10:20 | Adrian Oetzbach v Carl Emil Overbeck | 6-3,1-6,10-4 |
| ITF M15 Vejle | 2021/07/27 12:20 | Adrian Oetzbach v Vasil Kirkov | 7-5,3-6,3-6 |
| ITF M15 Vejle | 2021/07/26 08:00 | Adrian Oetzbach v Iiro Vasa | 6-3,7-5 |
| ITF M15 Esch/Alzette | 2021/07/19 08:55 | Marlon Vankan v Adrian Oetzbach | 6-3,6-7,10-6 |
| ITF M25 Wetzlar | 2021/08/02 10:15 | Hendrik Jebens v Mark Simons | 7-5,6-4 |
| ITF USA F32 Qual | 2015/11/06 21:00 | Mark Simons v Rico Gore | 6-0,6-2 |