Stadium: Court 6 Round: 62 Ground: Clay
| Challenger - Split | 2020/09/26 14:15 | Jaziri, Malek v Borna Devald | 6-1,7-5 |
| Adriatic Tennis Series | 2020/06/15 08:00 | Dino Prizmic v Borna Devald | 0-0 |
| German Championship | 2020/12/07 15:00 | Weindl, Michael v Onken, Julian | 6-2,5-2 |
| Irpin, Singles Qualifying M-ITF-UKR-04A | 2019/08/12 07:00 | Onken, Julian v Karpovets, Igor | 6-3,4-6,5-10 |
| ITF M15 Eupen | 2019/08/06 08:00 | Daniel De Jonge v Onken, Julian | 6-2,7-6 |
| ITF M15 Eupen | 2019/08/05 09:00 | Onken, Julian v Wakita, Shunsuke | 6-0,6-2 |
| ITF Germany F16 | 2018/10/23 10:30 | Leopold Zima v Onken, Julian | 4-6,6-3,6-2 |
| ITF Belgium F9 | 2018/08/21 12:30 | Onken, Julian v Herman, Louis | 4-6,6-3,2-6 |
| 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 |