Stadium: Court 1 Round: 62 Ground: Clay
| 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 Heilbronn | 2018/05/17 11:00 | Igor Sijsling v Jiri Vesely | 3-6,6-4,2-6 |
| Challenger Heilbronn Qual | 2018/05/14 11:00 | Miliaan Niesten v Igor Sijsling | 3-6,2-6 |
| Challenger Heilbronn Qual | 2018/05/13 09:00 | Christoph Negritu v Igor Sijsling | 4-6,0-6 |
| Challenger Glasgow | 2018/05/03 09:30 | Igor Sijsling v Roberto Ortega-Olmedo | 6-1,6-7,6-7 |
| ITF Germany F5 | 2018/06/25 08:00 | Jannik Rother v Marco Neubau | 6-3,6-0 |
| ITF Germany F5 | 2018/06/24 08:00 | Jannik Rother v Tejas Chaukulkar | 5-7,6-0,6-4 |
| ITF Qatar F2 Qual | 2018/03/03 09:35 | Tihomir Grozdanov v Jannik Rother | 6-3,7-6 |
| ITF Qatar F1 Qual | 2018/02/26 13:05 | Alexander Mannapov v Jannik Rother | 6-4,6-0 |
| ITF Qatar F1 Qual | 2018/02/25 13:55 | Jannik Rother v Pak Long Yeung | 5-7,6-1,6-2 |
| ITF Qatar F1 Qual | 2018/02/24 08:00 | Jannik Rother v Jannik Roettlingsberger | 6-2,6-4 |
| ITF Germany F15 | 2017/10/16 08:00 | Frederik Press v Jannik Rother | 7-6,6-0 |
| ITF Germany F15 | 2017/10/15 07:00 | Benedict Moerl v Jannik Rother | 4-6,6-7 |