Stadium: Center Court 1 Grosshesselohe Round: 1
| DTB German Pro Series | 2020/06/13 15:30 | Stebe, Cedrik-Marcel v Adrian Oetzbach | 6-1,7-6 |
| ITF M15 Austin | 2019/11/20 17:55 | Adrian Oetzbach v Roelofse, Ruan | 0-6,3-6 |
| ITF M15 Austin | 2019/11/19 16:00 | Adrian Oetzbach v Allen, Leighton | 6-4,2-6,5-10 |
| ITF M15 Austin | 2019/11/18 16:00 | Adrian Oetzbach v Steinhausen, Julian Noah | 6-0,6-3 |
| ITF M25 Malibu | 2019/11/06 01:05 | Song, Evan v Adrian Oetzbach | 6-7,6-3,6-4 |
| Houston, Singles Qualifying M-ITF-USA-28A | 2019/09/19 01:05 | Adrian Oetzbach v Alex Rybakov | 2-6,2-6 |
| ITF M15 Trier | 2019/08/14 10:00 | Ornago, Fabrizio v Adrian Oetzbach | 6-0,6-2 |
| ITF M15 Trier | 2019/08/13 12:20 | Adrian Oetzbach v Uryson, Nicolas | 6-3,6-2 |
| DTB German Pro Series | 2020/06/13 11:55 | Guttau, Niklas v Lucas Gerch | 4-6,3-6 |
| DTB German Pro Series | 2020/06/12 10:10 | Daniel Altmaier v Guttau, Niklas | 6-3,4-6,6-3 |
| DTB German Pro Series | 2020/06/11 16:25 | Maximilian Marterer v Guttau, Niklas | 6-1,6-3 |
| ITF - M15 Monastir | 2020/03/10 08:30 | Korolev, Vladimir v Guttau, Niklas | 6-2,6-1 |
| ITF - M15 Oberhaching | 2020/02/16 15:00 | Guttau, Niklas v Emilien Voisin | 6-4,6-7,6-10 |
| ITF - M15 Oberhaching | 2020/02/16 10:30 | Guttau, Niklas v Kuster, Joel | 6-4,7-6 |
| ITF - M15 Héraklion | 2019/11/24 08:00 | Guttau, Niklas v Manekas, Athanassios | 5-7,2-6 |
| ITF - M15 Sharm El Sheikh | 2019/11/20 10:35 | Hellfritsch, Lucas v Guttau, Niklas | 6-4,6-3 |