Stadium: Court 17 Round: 27 Ground: Clay
| ITF Qatar F4 | 2018/12/03 13:55 | Constantin Schmitz v Niklas Schell | 4-6,3-6 |
| ITF M15 Tabarka | 2019/05/17 09:00 | Mohamed Aziz Dougaz v Constantin Schmitz | 7-6,6-1 |
| ITF M15 Tabarka | 2019/05/16 12:45 | Alessandro Ingarao v Constantin Schmitz | 2-6,1-6 |
| ITF M15 Tabarka | 2019/05/15 08:00 | Hugo Schott v Constantin Schmitz | 1-6,4-6 |
| ITF M15 Troisdorf | 2019/05/10 10:00 | Constantin Schmitz v Kacper Zuk | 4-6,2-6 |
| ITF M15 Troisdorf | 2019/05/09 11:20 | Daniel De Jonge v Constantin Schmitz | 3-6,1-6 |
| ITF M15 Troisdorf | 2019/05/09 08:00 | Kai Wehnelt v Constantin Schmitz | 2-6,2-6 |
| ITF M15 Troisdorf | 2019/05/07 08:00 | Constantin Schmitz v Tomas Lipovsek Puches | 6-2,6-3 |
| ITF M15 Tabarka | 2019/04/26 11:45 | Constantin Schmitz v Geoffrey Blancaneaux | 5-7,0-6 |
| ITF M15 Antalya | 2019/05/15 12:50 | Grigoriy Lomakin v Niklas Schell | 6-2,6-4 |
| ITF M15 Antalya | 2019/05/08 11:35 | Niklas Schell v Georgii Kravchenko | 1-6,6-7 |
| ITF M15 Manama | 2019/03/19 08:00 | Lorenzo Frigerio v Niklas Schell | 4-6,6-3,6-1 |
| ITF M15 Sharm El Sheikh | 2019/03/04 08:00 | Neil Oberleitner v Niklas Schell | 6-7,6-4,8-10 |
| ITF M15 Kaarst | 2019/02/06 18:00 | Niklas Schell v Henri Squire | 3-6,2-6 |
| ITF M15 Kaarst | 2019/02/04 16:30 | Niklas Schell v Luca Gelhardt | 7-6,6-4 |
| ITF M15 Kaarst | 2019/02/04 08:30 | Niklas Schell v Noah Borges | 6-4,6-2 |
| ITF M25 Nussloch | 2019/01/21 13:35 | Tillmann Erdbories v Niklas Schell | 7-6,7-5 |