Round: 62 Ground: Hardcourt outdoor
| ITF USA F20 | 2018/07/25 17:20 | Jonathan Chang v Petros Chrysochos | 0-6,6-3,4-6 |
| ITF USA F20 | 2018/07/24 20:40 | Jonathan Chang v Jenson Brooksby | 6-4,6-4 |
| ITF USA F20 Qual | 2018/07/23 16:50 | Jonathan Chang v Alexander Cozbinov | 6-3,6-2 |
| ITF USA F20 Qual | 2018/07/22 16:30 | Jonathan Chang v Abhijeet Joshi | 6-1,6-3 |
| ITF USA F20 Qual | 2018/07/21 15:00 | Jonathan Chang v Kyle Johnson | 6-2,6-2 |
| ITF USA F15 Qual | 2018/06/16 15:30 | Jonathan Chang v Reese Stalder | 4-6,4-6 |
| ITF USA F13 Qual | 2018/06/10 14:00 | Drew Van Orderlain v Jonathan Chang | 7-5,6-2 |
| Challenger Irving Qual | 2018/03/12 17:30 | Arthur Rinderknech v Jonathan Chang | 6-1,6-4 |
| ITF USA F9 Qual | 2018/03/31 18:30 | David Metz v Andre Goransson | 0-6,2-6 |