Stadium: Court 4 Round: 26
| ITF Lebanon F1 | 2018/09/26 14:35 | Guillermo Olaso v Jaroslav Pospisil | 6-1,6-1 |
| ITF Germany F8 | 2018/07/19 11:35 | Orlando Luz v Guillermo Olaso | 7-6,6-0 |
| ITF Germany F8 | 2018/07/18 11:25 | Lucas Gerch v Guillermo Olaso | 2-6,3-6 |
| ITF Spain F16 | 2018/06/27 18:45 | Evan Hoyt v Guillermo Olaso | 4-6,6-2,6-4 |
| ITF Spain F16 | 2018/06/26 19:40 | Antonio Cembellin Prieto v Guillermo Olaso | 3-6,3-6 |
| ITF France F10 | 2018/06/19 11:15 | Guillermo Olaso v Eduard Guell | 4-6,6-3,7-6 |
| Challenger Poznan Qual | 2018/06/04 13:30 | Jeremy Jahn v Guillermo Olaso | 6-7,6-1,6-2 |
| Challenger Poznan Qual | 2018/06/04 08:00 | Ronald Slobodchikov v Guillermo Olaso | 4-6,6-3,1-6 |
| ITF Lebanon F1 | 2018/09/23 15:25 | Hasan Ibrahim v Marco De Rossi | 6-1,6-3 |
| ITF Germany F4 | 2018/06/17 12:00 | Patrick Zahraj v Hasan Ibrahim | 6-4,3-6,6-4 |
| ITF Germany F4 | 2018/06/16 10:30 | Hasan Ibrahim v Martins Rocens | 6-3,7-5 |
| ITF Greece F2 Qual | 2017/03/11 10:00 | Alexander Jhun v Hasan Ibrahim | 6-3,3-6,6-1 |
| ITF Greece F1 | 2017/03/05 08:00 | Filip Horansky v Hasan Ibrahim | 6-3,6-0 |