Stadium: Court 1 Round: 45 Ground: Hardcourt outdoor
| Challenger Knoxville | 2018/11/04 18:20 | Gijs Brouwer v Julian Lenz | 6-3,6-4 |
| Challenger Ismaning | 2018/10/14 09:00 | Julian Lenz v Albano Olivetti | 4-6,3-6 |
| Challenger Ismaning | 2018/10/13 09:00 | David Poljak v Julian Lenz | 6-7,2-6 |
| Challenger Ortisei | 2018/10/07 09:30 | Julian Lenz v Benjamin Hassan | 4-6,4-6 |
| Challenger Ortisei | 2018/10/06 12:05 | Julian Lenz v Robin Kern | 6-3,6-2 |
| Challenger Florence | 2018/09/29 08:00 | Julian Lenz v Joao Menezes | 4-6,4-6 |
| Challenger Sibiu | 2018/09/17 09:30 | Jelle Sels v Julian Lenz | 7-6,2-6,6-3 |
| Challenger Sibiu | 2018/09/16 10:35 | Johannes Haerteis v Julian Lenz | 4-6,4-6 |
| Challenger Knoxville | 2018/11/05 17:30 | Denis Yevseyev v Nathaniel Lammons | 6-2,6-1 |
| Challenger Knoxville | 2018/11/04 22:45 | Nathaniel Lammons v Daniel Nguyen | 6-4,3-6,6-4 |
| Challenger Bastad Qual | 2018/07/07 10:40 | Nathaniel Lammons v Sam Taylor | 6-4,3-6,4-6 |
| Challenger Loughborough Qual | 2018/05/19 10:35 | Alexis Canter v Nathaniel Lammons | 6-3,7-6 |
| Challenger Lisbon Qual | 2018/05/13 12:20 | David Vega Hernandez v Nathaniel Lammons | 6-2,3-6,6-2 |
| 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 |