Stadium: Eden 10 Round: 60 Ground: Clay
| 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 |
| Pakistan F2, Singles | 2017/12/15 05:00 | Nedelko, Ivan v Onken, Julian | 7-5,6-1 |
| Pakistan F2, Singles | 2017/12/14 06:25 | Abid, Muhammad v Onken, Julian | 0-6,1-6 |
| Pakistan F2, Singles | 2017/12/13 09:00 | Choudhary, Ahmed v Onken, Julian | 6-7,2-6 |
| ITF Croatia F1 | 2018/03/08 08:00 | Emilien Voisin v Kocevar-Desman, Tom | 4-6,1-6 |
| ITF Croatia F1 | 2018/03/04 12:30 | Yvo Panak v Kocevar-Desman, Tom | 6-3,0-6,1-6 |
| Coupe Davis | 2018/02/04 15:15 | Kocevar-Desman, Tom v Hubert Hurkacz | 3-6,2-6 |
| Challenger Ortisei Qual | 2017/10/08 13:15 | Arnaboldi, Andrea v Kocevar-Desman, Tom | 2-6,6-1,6-2 |
| ITF Netherlands F6 | 2017/08/26 14:00 | de Bakker, Thiemo v Kocevar-Desman, Tom | 6-3,6-3 |
| ITF Netherlands F6 | 2017/08/25 08:00 | Kocevar-Desman, Tom v Botic Van De Zandschulp | 6-4,6-0 |
| ITF Netherlands F6 | 2017/08/23 09:30 | Corentin Denolly v Kocevar-Desman, Tom | 4-6,2-6 |
| ITF Netherlands F6 | 2017/08/21 08:00 | Kocevar-Desman, Tom v Michiel de Krom | 7-5,6-4 |