Stadium: Centre Court Round: 54
| ITF Israel F4 | 2018/04/25 10:00 | Johannes Haerteis v Patrik Niklas-Salminen | 4-6,7-6,4-6 |
| ITF Tunisia F13 | 2018/04/05 12:00 | Johannes Haerteis v Clement Tabur | 7-6,5-7,5-7 |
| ITF Tunisia F13 | 2018/04/03 10:30 | Johannes Haerteis v Ezequiel A Santalla | 6-3,4-6,6-2 |
| ITF Greece F5 | 2018/03/29 07:30 | Johannes Haerteis v Baptiste Crepatte | 4-6,7-6,3-6 |
| ITF Greece F5 | 2018/03/27 12:00 | Calin Manda v Johannes Haerteis | 2-6,2-6 |
| ITF Italy F1 Qual | 2018/02/24 08:30 | Alexander Wolfschmidt v Johannes Haerteis | 0-6,0-6 |
| ITF Switzerland F2 | 2018/02/14 09:00 | Lukas Klein v Johannes Haerteis | 6-4,7-6 |
| ITF Switzerland F2 | 2018/02/13 11:40 | Johannes Haerteis v Hugo Grenier | 4-6,6-3,7-6 |
| Davis Cup | 2018/04/07 10:00 | Frederik Nielsen v Karim-Mohamed Maamoun | 6-3,3-6,6-7 |
| Challenger Drummondville Qual | 2018/03/12 22:55 | Frederik Nielsen v Aleksandar Vukic | 2-6,4-6 |
| Challenger Drummondville Qual | 2018/03/11 17:15 | Frederik Nielsen v Pavel Krainik | View |
| ITF Canada F2 | 2018/03/06 15:00 | Frederik Nielsen v Jared Hiltzik | 4-6,6-4,2-6 |
| ITF Canada F2 Qual | 2018/03/05 14:30 | Frederik Nielsen v Ricardo Rodriguez-Pace | 3-6,6-3,6-4 |
| ITF Canada F2 Qual | 2018/03/04 15:00 | Frederik Nielsen v Luis David Martinez | 6-3,6-4 |
| ITF Canada F1 | 2018/02/27 16:00 | Deiton Baughman v Frederik Nielsen | 6-3,6-3 |
| ITF Great Britain F3 | 2018/02/14 13:40 | Ronnie Schneider v Frederik Nielsen | 6-2,6-4 |