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