Stadium: Court 3 Round: 25
| 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 |
| Challenger Poznan Qual | 2018/06/03 09:25 | Juan Pablo Ficovich v Guillermo Olaso | 4-6,2-6 |
| ITF Serbia F4 | 2018/08/31 09:00 | Tadeas Paroulek v Jaroslav Pospisil | 6-4,6-1 |
| ITF Serbia F4 | 2018/08/30 09:00 | Aleksa Bucan v Jaroslav Pospisil | 3-6,1-6 |
| ITF Serbia F4 | 2018/08/28 08:00 | Stefan Petrovic v Jaroslav Pospisil | 5-7,0-6 |
| Challenger Prostejov Qual | 2018/06/03 14:15 | Jaroslav Pospisil v Gianluca Mager | 6-4,1-6,5-7 |
| Challenger Prostejov Qual | 2018/06/03 08:00 | Jaroslav Pospisil v Dominik Kellovsky | 6-3,6-4 |
| ITF Turkey F14 | 2018/04/15 07:30 | Nino Serdarusic v Jaroslav Pospisil | 6-2,2-6,6-3 |
| ITF Turkey F14 | 2018/04/14 07:30 | Jaroslav Pospisil v Sebastian Baez | 6-3,6-4 |
| ITF Turkey F14 | 2018/04/13 07:30 | Jaroslav Pospisil v Marc Sieber | 6-2,6-4 |