Stadium: Court 2 Round: 25 Ground: Hardcourt outdoor
| ITF Turkey F14 | 2018/04/07 11:00 | Niklas Guttau v Lucas Hellfritsch | 4-6,3-6 |
| ITF M15 Sharm El Sheikh | 2019/11/19 09:45 | Lucas Hellfritsch v Pelle Boerma | 6-7,6-4,11-9 |
| ITF M15 Sharm El Sheikh | 2019/11/10 11:00 | Lucas Hellfritsch v Daniele Catini | 6-7,4-6 |
| ITF M15 Antalya | 2019/10/23 08:30 | Ronald Slobodchikov v Lucas Hellfritsch | 6-3,6-3 |
| ITF M15 Antalya | 2019/10/22 07:00 | Benedikt Emesz v Lucas Hellfritsch | 6-7,3-6 |
| ITF M15 Antalya | 2019/10/21 07:00 | Augusto Virgili v Lucas Hellfritsch | 4-6,6-4,8-10 |
| ITF M15 Antalya | 2019/10/20 09:00 | Daniil Gusev v Lucas Hellfritsch | 1-6,1-6 |
| ITF M15 Antalya | 2019/10/02 07:00 | Marsel Ilhan v Lucas Hellfritsch | 6-2,6-2 |
| ITF M15 Antalya | 2019/10/01 07:00 | Lucas Hellfritsch v Lynn Max Kempen | 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 |
| ITF M15 Sharm El Sheikh | 2019/11/13 11:40 | Mariano Alberto Hasenkopf v Niklas Guttau | 3-6,5-7 |
| ITF M15 Sharm El Sheikh | 2019/11/06 12:35 | Niklas Guttau v Sidane Pontjodikromo | 3-6,2-6 |
| Challenger Eckental | 2019/10/29 11:40 | Maxime Cressy v Niklas Guttau | 6-3,7-5 |
| Challenger Hamburg | 2019/10/22 09:40 | Jelle Sels v Niklas Guttau | 7-6,6-2 |
| ITF M15 Tabarka | 2019/10/09 09:55 | Niklas Guttau v Alexander Weis | 6-7,2-6 |
| ITF M15 Tabarka | 2019/10/02 08:30 | Niklas Guttau v Bogdan Bobrov | 0-6,6-3,4-6 |
| ITF M15 Tabarka | 2019/09/26 08:30 | Giacomo Dambrosi v Niklas Guttau | 5-7,6-4,6-3 |