Stadium: Court 5 Round: 25 Ground: Clay
| Challenger - Augsburg | 2019/08/06 13:20 | Facundo Mena v Guttau, Niklas | 6-4,7-5 |
| Challenger - Augsburg | 2019/08/05 08:00 | Geoffrey Blancaneaux v Guttau, Niklas | 6-4,6-1 |
| ITF M15 Parnu | 2019/07/18 07:30 | Guttau, Niklas v Georgii Kravchenko | 6-2,4-6,4-6 |
| Braunchsweig, Germany | 2019/07/08 08:00 | Guttau, Niklas v Kamke, Tobias | 5-7,4-6 |
| Braunchsweig, Germany | 2019/07/07 08:00 | Duran, Guillermo v Guttau, Niklas | 6-7,6-7 |
| Saarlouis, Singles Qualifying M-ITF-GER-07A | 2019/07/04 11:45 | Guttau, Niklas v Boehler, Dominik | 4-6,5-7 |
| Saarlouis, Singles Qualifying M-ITF-GER-07A | 2019/07/02 10:00 | Erler, Alexander v Guttau, Niklas | 4-6,6-4,5-7 |
| Kaltenkirchen, Singles Qualifying M-ITF-GER-05A | 2019/06/12 10:30 | Eriksson, Markus v Guttau, Niklas | 6-3,6-1 |
| Tabarka, Singles Qualifying M-ITF-TUN-41A | 2019/09/16 08:30 | Fausto Tabacco v Cordonnier, Gregorio | 6-4,7-5 |
| Tabarka, Singles Qualifying M-ITF-TUN-41A | 2019/09/15 09:30 | Rhys Searant v Cordonnier, Gregorio | 3-6,1-6 |
| Tabarka, Singles Qualifying M-ITF-TUN-41A | 2019/09/11 10:15 | Eisinga, Zachary v Cordonnier, Gregorio | 6-2,6-3 |
| Tabarka, Singles Qualifying M-ITF-TUN-41A | 2019/09/09 09:00 | Cordonnier, Gregorio v Nareyka, Bjorn | 6-4,6-2 |
| La Marsa, Singles M-ITF-TUN-37A | 2019/09/03 11:45 | Cordonnier, Gregorio v Bortolotti, Marco | 3-6,4-6 |
| La Marsa, Singles M-ITF-TUN-37A | 2019/09/02 11:00 | Cordonnier, Gregorio v Ben Yaacoub, Hamza | 6-2,7-5 |
| Tabarka, Singles Qualifying M-ITF-TUN-41A | 2019/08/28 08:00 | Sebastian Baez v Cordonnier, Gregorio | 6-2,6-2 |
| Tabarka, Singles Qualifying M-ITF-TUN-41A | 2019/08/26 13:00 | Saffratti, Marco v Cordonnier, Gregorio | 5-7,6-4,13-15 |