Stadium: Court Belem Round: 46 Ground: Clay
| Challenger Lisbon Qual | 2018/05/12 13:35 | Christopher Heyman v David Vega Hernandez | 1-6,3-6 |
| Challenger Braga | 2018/05/08 09:00 | Goncalo Oliveira v David Vega Hernandez | 7-6,4-6,6-2 |
| Challenger Braga Qual | 2018/05/06 12:20 | Zhizhen Zhang v David Vega Hernandez | 6-7,6-2,4-6 |
| Challenger Braga Qual | 2018/05/05 14:00 | David Vega Hernandez v Eduard Esteve Lobato | 2-6,6-1,6-3 |
| Challenger Braga Qual | 2018/05/05 10:25 | Goncalo Ferreira v David Vega Hernandez | 3-6,1-6 |
| Challenger Francavilla Qual | 2018/04/21 08:00 | David Vega Hernandez v Elliot Benchetrit | 4-6,2-6 |
| Challenger Tunis Qual | 2018/04/14 11:20 | Pedro Martinez v David Vega Hernandez | 6-1,6-3 |
| Challenger Alicante Qual | 2018/04/01 11:45 | Mario Vilella Martinez v David Vega Hernandez | 6-3,7-6 |
| Challenger Lisbon Qual | 2018/05/12 11:40 | Goncalo Falcao v Nathaniel Lammons | 6-2,5-7,4-6 |
| Challenger Savannah Qual | 2018/04/28 18:35 | Karue Sell v Nathaniel Lammons | 6-4,6-4 |
| Challenger Tallahassee Qual | 2018/04/21 17:30 | Nathaniel Lammons v Yoshihito Nishioka | 2-6,0-6 |
| Challenger Tallahassee Qual | 2018/04/21 14:00 | Nathaniel Lammons v Robert Galloway | 7-5,6-4 |
| Challenger Panama City Qual | 2018/03/31 22:45 | Nathaniel Lammons v Franco Agamenone | 2-6,4-6 |
| Challenger Panama City Qual | 2018/03/31 16:55 | Luis Gomez v Nathaniel Lammons | 2-6,6-7 |
| Challenger Drummondville Qual | 2018/03/11 17:15 | Alejandro Gomez v Nathaniel Lammons | 6-4,6-1 |
| Challenger Launceston | 2018/02/06 00:45 | Nathaniel Lammons v Bradley Mousley | 7-6,5-7,2-6 |