Stadium: Court 2 Round: 46 Ground: Hardcourt indoor
| Challenger Dallas Qual | 2018/01/27 17:20 | Arnau Dachs v Olaso, Guillermo | 3-6,4-6 |
| Newport Beach, USA | 2018/01/23 21:25 | Taylor Fritz v Olaso, Guillermo | 6-3,6-4 |
| Challenger Newport Beach Qual | 2018/01/22 18:00 | Olaso, Guillermo v Aragone, JC | 6-3,2-6,7-6 |
| Challenger Newport Beach Qual | 2018/01/21 20:25 | Schnur, Brayden v Olaso, Guillermo | 6-4,4-6,4-6 |
| Challenger Newport Beach Qual | 2018/01/20 22:05 | Pavic, Ante v Olaso, Guillermo | 3-6,3-6 |
| Bangkok, Thaïlande | 2018/01/09 03:00 | Olaso, Guillermo v Pedro Martinez | 4-6,4-6 |
| ITF USA F1 | 2018/01/04 20:40 | Olaso, Guillermo v Christopher Eubanks | 1-6,3-6 |
| ITF USA F1 | 2018/01/02 19:35 | Brandon Nakashima v Olaso, Guillermo | 2-6,6-7 |
| ITF Argentina F12 | 2017/12/07 14:30 | Federico Coria v Heras, Patricio | 7-6,6-4 |
| ITF Argentina F12 | 2017/12/06 15:00 | Vilaro, Alejo v Heras, Patricio | 3-6,2-6 |
| ITF Argentina F11 | 2017/11/30 16:30 | Cuevas, Martin v Heras, Patricio | 2-6,6-3,7-6 |
| ITF Argentina F11 | 2017/11/29 14:00 | Franco Agamenone v Heras, Patricio | 0-6,6-3,5-7 |
| ITF Argentina F11 | 2017/11/28 14:50 | Bacella, Nicolas v Heras, Patricio | 4-6,2-6 |
| Challenger Santiago 2 | 2017/11/16 19:35 | Dutra Silva, Rogerio v Heras, Patricio | 6-4,6-4 |
| Challenger Santiago 2 | 2017/11/15 19:25 | Heras, Patricio v Facundo Bagnis | 6-4,5-7,6-3 |
| Challenger Santiago 2 | 2017/11/13 21:00 | Heras, Patricio v Saez, Juan Carlos | 7-6,6-4 |