| ITF USA F13 Qual | 2018/06/09 15:30 | Andrew Carter v Charles Sullivan | 4-6,6-2,6-0 |
| ITF USA F11 | 2018/04/15 12:00 | Charles Sullivan v Marcelo Sepulveda | 2-6,3-6 |
| ITF USA F10 Qual | 2018/04/09 15:00 | Charles Sullivan v Christopher G Haworth | 1-6,4-6 |
| ITF USA F10 Qual | 2018/04/08 16:00 | Charles Sullivan v Darryl Hale | 6-2,6-4 |
| ITF USA F9 Qual | 2018/04/02 15:45 | Ryan Peniston v Charles Sullivan | 6-0,6-1 |
| ITF USA F9 Qual | 2018/04/01 16:30 | Nicholas Shamma v Charles Sullivan | 3-6,2-6 |
| ITF USA F9 Qual | 2018/03/31 17:30 | Charles Sullivan v Vlad Andrei Dancu | 3-6,6-2,6-0 |
| ITF USA F5 | 2018/01/19 17:00 | Ritik Sundaram v Charles Sullivan | 6-2,6-2 |