Stadium: Court 1 Round: 25 Ground: Clay
| ITF Germany F9 | 2018/07/22 16:30 | Onken, Julian v Maik Steiner | 2-6,6-2,4-6 |
| ITF Germany F9 | 2018/07/22 14:15 | Onken, Julian v Sharma, Arpit | 6-0,6-3 |
| ITF Croatia F1 | 2018/03/08 12:30 | Onken, Julian v Kocevar-Desman, Tom | 2-6,1-6 |
| ITF Croatia F1 | 2018/03/07 11:30 | Onken, Julian v Peters, Flemming | 6-4,7-5 |
| ITF Croatia F1 | 2018/03/07 08:00 | Onken, Julian v Erwin Troebinger | 6-4,6-0 |
| ITF Pakistan F3 | 2017/12/21 06:20 | Onken, Julian v Lopez Perez | 2-6,4-6 |
| ITF Pakistan F3 | 2017/12/20 05:00 | Onken, Julian v Luka Pavlovic | 6-1,3-6,6-3 |
| ITF Pakistan F3 | 2017/12/19 05:00 | Onken, Julian v Khan, Aqeel | 6-2,6-2 |
| ITF Belgium F1 | 2018/06/19 09:55 | Herman, Louis v Merckx, Jonas | 3-6,0-6 |
| ITF Belgium F2 | 2017/06/28 14:00 | Herman, Louis v Poncelet, Victor | 4-6,6-7 |
| Challenger Mons Qual | 2016/10/01 10:00 | Merckx, Jonas v Herman, Louis | 6-3,4-6,6-1 |