Round: 62 Ground: Clay
| ITF Belgium F6 Qual | 2018/07/28 09:30 | Amaury Delmas v Oscar Matias Leiva Biason | 6-0,6-3 |
| ITF Germany F9 | 2018/07/22 08:00 | Oscar Matias Leiva Biason v Moritz Dettinger | 2-6,1-6 |
| ITF Belgium F4 | 2018/07/14 07:00 | Javier Naser v Oscar Matias Leiva Biason | 6-2,6-0 |
| ITF Germany F7 | 2018/07/09 08:00 | Andres Urrea v Oscar Matias Leiva Biason | 7-6,6-2 |
| ITF Belgium F2 Qual | 2018/06/24 14:50 | Oscar Matias Leiva Biason v Paul Valsecchi | 2-6,1-6 |
| ITF Belgium F2 Qual | 2018/06/23 13:20 | Oscar Matias Leiva Biason v Yannis Zekri | 6-1,6-0 |
| ITF Egypt F13 | 2018/04/08 08:00 | Issam Haitham Taweel v Oscar Matias Leiva Biason | 6-2,6-0 |
| ITF Egypt F12 | 2018/03/31 08:00 | Joao Giannella v Oscar Matias Leiva Biason | 6-2,6-1 |
| ITF Germany F10 Qual | 2018/07/29 08:00 | Niklas Koch v Javier A V. Meza | 6-1,6-0 |
| ITF France F15 Qual | 2018/07/21 11:05 | Javier A V. Meza v Marcel Marlon Sudzum | 1-6,0-6 |