Stadium: S & S Court Round: 45 Ground: Clay
| ITF Germany F14 | 2017/10/11 16:00 | Daniel Masur v Johannes Haerteis | 7-6,6-3 |
| Challenger Loughborough Qual | 2018/05/21 09:30 | Johannes Haerteis v Frederik Nielsen | 6-7,1-6 |
| Challenger Loughborough Qual | 2018/05/20 09:30 | Viktor Durasovic v Johannes Haerteis | 6-7,5-7 |
| Challenger Loughborough Qual | 2018/05/19 11:10 | Johannes Haerteis v Sean Hodkin | 6-3,6-7,6-4 |
| ITF Israel F6 | 2018/05/11 07:30 | Johannes Haerteis v Matias Franco Descotte | 2-6,4-6 |
| ITF Israel F6 | 2018/05/08 11:30 | Johannes Haerteis v Uri Vodavoz | 6-0,6-1 |
| ITF Israel F5 | 2018/05/04 07:30 | Johannes Haerteis v Matias Franco Descotte | 3-6,2-6 |
| ITF Israel F5 | 2018/05/03 07:30 | Nicolas Uryson v Johannes Haerteis | 6-7,1-6 |
| ITF Israel F5 | 2018/05/01 07:00 | Jordan Hasson v Johannes Haerteis | 5-7,4-6 |
| Challenger Mestre | 2018/05/23 08:30 | Daniel Masur v Gian Marco Moroni | 3-6,2-6 |
| Challenger Mestre Qual | 2018/05/20 08:30 | Daniel Masur v Gianluca Mager | 7-5,6-4 |
| Challenger Mestre Qual | 2018/05/19 08:30 | Daniel Masur v Evan Song | 6-4,6-2 |
| Challenger Heilbronn | 2018/05/15 15:15 | Dominik Koepfer v Daniel Masur | 7-5,6-4 |
| Challenger Heilbronn Qual | 2018/05/14 11:55 | Daniel Masur v Julian Lenz | 4-6,6-0,6-1 |
| Challenger Heilbronn Qual | 2018/05/13 13:00 | Daniel Masur v Denys Molchanov | 6-3,6-3 |
| Challenger Rome Qual | 2018/05/06 10:10 | Daniel Masur v Roberto Marcora | 6-1,2-6,5-7 |
| Challenger Rome Qual | 2018/05/06 08:00 | Francesco Bessire v Daniel Masur | 2-6,0-6 |