Stadium: Court 4 Round: 25 Ground: Clay
| ITF Germany F8 Qual | 2018/07/16 13:45 | Nikolas Walterscheid-Tukic v Lucas Gerch | 4-6,4-6 |
| ITF Germany F8 Qual | 2018/07/15 08:00 | Andres Urrea v Lucas Gerch | 3-6,6-1,5-7 |
| ITF Germany F7 | 2018/07/11 11:45 | Jonas Merckx v Lucas Gerch | 6-4,3-6,6-3 |
| ITF Germany F6 | 2018/07/01 08:00 | Lucas Gerch v Jannik Rother | 6-7,4-6 |
| ITF Czech Republic F2 Qual | 2018/05/21 08:00 | Lucas Gerch v Dominique Graf | 6-3,6-0 |
| ITF Israel F3 | 2018/03/20 08:00 | Simon Beaupain v Lucas Gerch | 1-6,3-6 |
| ITF Israel F3 | 2018/03/19 08:00 | Lucas Gerch v Motvey Radionov | 6-3,6-0 |
| ITF Israel F2 | 2018/03/14 11:25 | Patrik Niklas-Salminen v Lucas Gerch | 6-1,6-4 |
| 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 |
| Challenger Busan Qual | 2018/05/14 02:00 | Rubin Statham v Guillermo Olaso | 6-4,6-2 |
| Challenger Busan Qual | 2018/05/13 02:00 | Thomas Fancutt v Guillermo Olaso | 1-6,5-7 |