Stadium: Court 1 Round: 46
| ITF Germany F17 | 2015/10/23 10:30 | Jeremy Jahn v Niels Lootsma | 6-3,6-3 |
| Challenger Scheveningen Qual | 2018/07/14 15:15 | Jeremy Jahn v Dan Added | 6-1,6-2 |
| Challenger - Poznan | 2018/06/07 16:45 | Alexey Vatutin v Jeremy Jahn | 7-6,4-6,6-3 |
| Challenger - Poznan | 2018/06/06 14:00 | Jeremy Jahn v Kamil Majchrzak | 6-3,2-6,6-0 |
| Challenger Poznan Qual | 2018/06/04 13:30 | Jeremy Jahn v Guillermo Olaso | 6-7,6-1,6-2 |
| Challenger Poznan Qual | 2018/06/04 08:00 | Bernabe Zapata Miralles v Jeremy Jahn | 4-6,6-3,0-6 |
| Challenger Poznan Qual | 2018/06/03 08:00 | Kacper Zuk v Jeremy Jahn | 3-6,4-6 |
| ATP Geneva Qual | 2018/05/20 10:50 | Jeremy Jahn v Lukas Rosol | 7-6,3-6,5-7 |
| ATP Geneva Qual | 2018/05/19 14:25 | Nino Serdarusic v Jeremy Jahn | 4-6,4-6 |
| Challenger Scheveningen Qual | 2018/07/14 16:25 | Alen Avidzba v Niels Lootsma | 3-6,3-6 |
| ITF Netherlands F3 | 2018/07/13 15:50 | Tim Van Rijthoven v Niels Lootsma | 7-6,6-4 |
| ITF Netherlands F3 | 2018/07/10 13:05 | Niels Lootsma v Fernando Yamacita | 3-6,6-2,6-3 |
| ITF Netherlands F2 | 2018/07/03 10:10 | Orlando Luz v Niels Lootsma | 1-6,6-3,6-4 |
| ITF Netherlands F1 Qual | 2018/06/25 10:50 | Niels Lootsma v Guillaume Dermiens | 4-6,6-7 |
| ITF Netherlands F1 Qual | 2018/06/24 09:00 | Niels Lootsma v Rob Reynolds | 6-3,6-4 |
| ITF Czech Republic F1 | 2018/05/16 08:00 | Niels Lootsma v Michal Konecny | 7-5,3-6,4-6 |
| ITF Egypt F17 | 2018/05/10 09:05 | Niels Lootsma v Ronald Slobodchikov | 6-2,6-7,2-6 |