Stadium: Centre Court Round: 26 Ground: Hardcourt indoor
| Challenger Glasgow | 2018/04/30 11:15 | Evgeny Karlovskiy v Guillermo Olaso | 6-7,3-6 |
| ITF Spain F9 | 2018/04/19 14:00 | Guillermo Olaso v Steven Diez | 7-6,1-6,5-7 |
| ITF Spain F9 | 2018/04/17 09:25 | Guillermo Olaso v Adrien Bossel | 6-2,6-4 |
| Challenger Alicante Qual | 2018/03/31 09:55 | Carlos Gomez-Herrera v Guillermo Olaso | 2-6,7-6,7-5 |
| Challenger Marbella Qual | 2018/03/24 19:25 | Federico Gaio v Guillermo Olaso | 7-5,7-6 |
| Challenger Lille | 2018/03/23 19:00 | Guillermo Olaso v Gregoire Barrere | 0-6,1-6 |
| Challenger Lille | 2018/03/21 18:00 | Nicolas Mahut v Guillermo Olaso | 6-7,7-6,3-6 |
| Challenger Lille | 2018/03/20 18:05 | Guillermo Olaso v Yannick Mertens | 5-7,6-1,6-3 |
| Challenger Glasgow | 2018/04/30 13:00 | Lloyd Glasspool v Marek Jaloviec | 6-3,6-2 |
| Challenger Leon Qual | 2018/04/21 21:15 | Alejandro Gomez v Lloyd Glasspool | 7-5,7-5 |
| Challenger Guadalajara Qual | 2018/04/15 17:40 | Lloyd Glasspool v Joao Souza | 6-3,6-7,6-7 |
| Challenger Guadalajara Qual | 2018/04/14 18:00 | Lloyd Glasspool v Cristian Rodriguez | 6-4,6-4 |
| Challenger Le Gosier | 2018/03/27 22:10 | Lloyd Glasspool v Filip Peliwo | 4-6,1-6 |
| ITF USA F8 | 2018/03/20 22:25 | Lloyd Glasspool v Martin Redlicki | 3-6,2-6 |
| ITF USA F7 | 2018/03/17 17:00 | Lloyd Glasspool v Borna Gojo | 3-6,4-6 |
| ITF USA F7 | 2018/03/15 18:50 | Lloyd Glasspool v Evan Song | 7-5,6-3 |