Stadium: Center Court 1 Grosshesselohe Round: 1
| DTB German Pro Series | 2020/06/12 10:10 | Daniel Altmaier v Niklas Guttau | 6-3,4-6,6-3 |
| DTB German Pro Series | 2020/06/11 16:25 | Maximilian Marterer v Niklas Guttau | 6-1,6-3 |
| ITF - M15 Monastir | 2020/03/10 08:30 | Vladimir Korolev v Niklas Guttau | 6-2,6-1 |
| ITF - M15 Oberhaching | 2020/02/16 15:00 | Niklas Guttau v Emilien Voisin | 6-4,6-7,6-10 |
| ITF - M15 Oberhaching | 2020/02/16 10:30 | Niklas Guttau v Joel Kuster | 6-4,7-6 |
| ITF - M15 Heraklion | 2019/11/24 08:00 | Niklas Guttau v Athanassios Manekas | 5-7,2-6 |
| ITF - M15 Sharm-el-Sheikh | 2019/11/20 10:35 | Lucas Hellfritsch v Niklas Guttau | 6-4,6-3 |
| ITF - M15 Sharm-el-Sheikh | 2019/11/14 09:20 | Giorgio Ricca v Niklas Guttau | 6-2,4-6,7-6 |
| DTB German Pro Series | 2020/06/12 16:25 | Maximilian Marterer v Lucas Gerch | 6-3,6-1 |
| DTB German Pro Series | 2020/06/11 11:40 | Daniel Altmaier v Lucas Gerch | 6-2,7-6 |
| Challenger - Koblenz | 2020/02/19 09:00 | Tallon Griekspoor v Lucas Gerch | 6-4,2-6,7-6 |
| Challenger - Koblenz | 2020/02/18 10:20 | Enrico Dalla Valle v Lucas Gerch | 1-6,4-6 |
| Challenger - Koblenz | 2020/02/17 09:00 | Lucas Gerch v Johann Willems | 6-1,6-7,6-1 |
| ITF - M25 Naples | 2020/02/13 15:00 | Eduard Esteve Lobato v Lucas Gerch | 7-6,4-6,7-5 |
| ITF - M25 Naples | 2020/02/11 16:25 | Lucas Gerch v Javier Barranco Cosano | 7-5,6-3 |
| ITF M25 - Palm Coast | 2020/02/06 16:55 | Gianluigi Quinzi v Lucas Gerch | 3-6,7-6,6-1 |