Stadium: Court 1 Round: 54
| Challenger Busan Qual | 2018/05/13 02:00 | Rubin Statham v Tae-Woo Lee | 7-6,6-3 |
| Challenger Busan Qual | 2018/05/12 02:50 | Rubin Statham v Min Gyo Seo | 6-1,6-0 |
| Challenger Gimcheon | 2018/05/08 02:00 | Rubin Statham v Go Soeda | 2-6,6-3,4-6 |
| Challenger Puerto Vallarta | 2018/04/30 20:25 | Rubin Statham v Jose Hernandez-Fernandez | 2-6,4-6 |
| Challenger Leon | 2018/04/25 18:00 | Rubin Statham v Roberto Quiroz | 6-3,6-7,2-6 |
| Challenger Leon | 2018/04/24 15:00 | Marcelo Arevalo v Rubin Statham | 5-7,6-4,2-6 |
| Challenger Leon Qual | 2018/04/23 16:00 | Rubin Statham v Tobias Simon | 7-6,6-3 |
| Challenger Leon Qual | 2018/04/22 17:30 | Rubin Statham v Franco Agamenone | 7-6,6-2 |
| Challenger Busan Qual | 2018/05/13 02:00 | Thomas Fancutt v Guillermo Olaso | 1-6,5-7 |
| Challenger Busan Qual | 2018/05/12 01:00 | Jae Hwan Kim v Guillermo Olaso | 0-6,5-7 |
| Challenger Glasgow | 2018/05/04 09:30 | Lukas Lacko v Guillermo Olaso | 6-2,6-3 |
| Challenger Glasgow | 2018/05/02 13:50 | Guillermo Olaso v Lloyd Glasspool | 6-4,6-3 |
| 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 |