Stadium: Court 17 Round: 27 Ground: Clay
| ITF Qatar F4 | 2018/12/03 13:55 | Schmitz, Constantin v Niklas Schell | 4-6,3-6 |
| ITF M15 Trier | 2019/08/14 10:00 | Schmitz, Constantin v Ibrahim, Hasan | 6-3,6-2 |
| ITF M15 Trier | 2019/08/13 11:05 | Schmitz, Constantin v Tim Handel | 6-1,6-2 |
| Wetzlar, Singles Qualifying M-ITF-GER-11A | 2019/08/07 14:00 | Cayre, Paul v Schmitz, Constantin | 6-1,6-4 |
| Wetzlar, Singles Qualifying M-ITF-GER-11A | 2019/08/06 08:00 | Borg, Maikel v Schmitz, Constantin | 1-6,1-6 |
| Bad Schussenried, Singles Qualifying M-ITF-GER-10A | 2019/07/23 08:30 | Henri Squire v Schmitz, Constantin | 7-5,6-3 |
| Karlsruhe, Singles M-ITF-GER-04A | 2019/06/03 09:00 | Adrian Oetzbach v Schmitz, Constantin | 6-4,7-5 |
| Tabarka, Singles Qualifying M-ITF-TUN-41A | 2019/05/17 09:00 | Dougaz, Aziz v Schmitz, Constantin | 7-6,6-1 |
| Tabarka, Singles Qualifying M-ITF-TUN-41A | 2019/05/16 12:45 | Alessandro Ingarao v Schmitz, Constantin | 2-6,1-6 |
| ITF M15 Trier | 2019/08/14 10:00 | Niklas Schell v Kai Wehnelt | 7-6,3-6,7-6 |
| ITF M15 Trier | 2019/08/13 09:30 | Niklas Schell v Hartmeier, Patrik | 6-4,6-2 |
| Wetzlar, Singles Qualifying M-ITF-GER-11A | 2019/08/06 11:30 | Niklas Schell v Netuschil, Marvin | 6-7,4-6 |
| ITF M25 Kassel | 2019/07/16 15:30 | Niklas Schell v Chun Hsin Tseng | 1-6,4-6 |
| ITF M15 Marburg | 2019/07/08 07:00 | Muscheites, Lasse v Niklas Schell | 6-4,6-2 |
| ITF M15 Kamen | 2019/06/24 12:00 | Staeheli, Luca v Niklas Schell | 7-6,7-5 |
| ITF M15 Kamen | 2019/06/24 08:00 | Daniil Glinka v Niklas Schell | 3-6,2-6 |
| Kaltenkirchen, Singles Qualifying M-ITF-GER-05A | 2019/06/10 13:00 | Mats Rosenkranz v Niklas Schell | 7-6,6-1 |