Ground: Hardcourt indoor
| Challenger Wroclaw | 2017/02/28 12:40 | Igor Sijsling v Jeremy Jahn | 6-4,6-2 |
| Challenger Como | 2018/08/25 12:10 | Igor Sijsling v Facundo Arguello | 5-7,1-6 |
| Challenger Lexington | 2018/07/31 17:55 | Ronnie Schneider v Igor Sijsling | 6-2,6-4 |
| ITF Germany F5 | 2018/06/27 15:25 | Filip Bergevi v Igor Sijsling | 6-1,6-2 |
| ITF Germany F5 | 2018/06/25 09:00 | Igor Sijsling v Jannik Rother | 6-1,6-3 |
| ITF Germany F5 | 2018/06/25 08:00 | Igor Sijsling v Quentin Folliot | 6-2,6-4 |
| Challenger Loughborough Qual | 2018/05/21 12:20 | Igor Sijsling v Jurij Rodionov | 6-7,3-6 |
| Challenger Loughborough Qual | 2018/05/20 14:30 | Igor Sijsling v Peter Bothwell | 6-4,6-2 |
| Challenger Loughborough Qual | 2018/05/19 17:20 | Igor Sijsling v Julian Ocleppo | 6-4,6-7,6-1 |
| Challenger Florence | 2018/09/29 13:45 | Jeremy Jahn v Nicola Kuhn | 3-6,6-3,4-6 |
| Challenger Sibiu | 2018/09/18 10:00 | Simone Bolelli v Jeremy Jahn | 6-4,6-4 |
| Challenger Sibiu | 2018/09/17 08:00 | Javier Barranco Cosano v Jeremy Jahn | 1-6,4-6 |
| Challenger Sibiu | 2018/09/16 07:00 | Mircea-Alexandru Jecan v Jeremy Jahn | 3-6,1-6 |
| Challenger Mallorca | 2018/08/26 09:50 | Joao Menezes v Jeremy Jahn | 6-3,6-4 |
| ITF Poland F7 | 2018/08/19 09:00 | Jeremy Jahn v Pedro Sakamoto | 6-3,6-4 |
| ITF Poland F7 | 2018/08/18 10:00 | Thiago Seyboth Wild v Jeremy Jahn | 5-7,6-7 |
| ITF Poland F7 | 2018/08/17 10:30 | Jeremy Jahn v Christian Lindell | 6-1,6-4 |