Stadium: Court 4 Round: 26 Ground: Hardcourt indoor
| ITF Lebanon F1 | 2018/09/29 13:00 | Alexandre Muller v Guillermo Olaso | 4-6,6-3,6-0 |
| ITF Lebanon F1 | 2018/09/28 13:00 | Guillermo Olaso v Edoardo Eremin | 6-1,6-4 |
| ITF Lebanon F1 | 2018/09/27 13:00 | Guillermo Olaso v Hasan Ibrahim | 6-2,6-4 |
| 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 M25 Anapoima | 2024/05/02 14:55 | Vitor Leal v Leo Vithoontien | 5-7,4-6 |
| ITF M25 Anapoima | 2024/05/01 17:30 | Mateo Castaneda v Leo Vithoontien | 1-6,4-6 |
| ITF M25 Mosquera | 2024/04/22 21:50 | Leo Vithoontien v Juan Sebastian Osorio | 6-3,3-6,2-6 |
| ITF M15 Santiago | 2024/04/18 14:00 | Thomas Brown v Leo Vithoontien | 6-3,4-6,6-2 |
| ITF M15 Santiago | 2024/04/16 13:00 | Manuel Mouilleron Salvo v Leo Vithoontien | 3-6,6-3,1-6 |
| ITF M15 Kashiwa | 2024/04/04 03:15 | Shintaro Imai v Leo Vithoontien | 6-3,6-3 |
| ITF M15 Kashiwa | 2024/04/03 04:50 | Leo Vithoontien v Stefanos Sakellaridis | 4-6,7-5,7-5 |
| ITF M15 Kashiwa | 2024/04/01 06:00 | Leo Vithoontien v Masamichi Imamura | 5-7,6-7 |