Round: 62 Ground: Clay
| 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 Canada F2 Qual | 2018/03/04 15:00 | Baughman, Deiton v Chang, Jonathan | 6-1,6-1 |
| ITF Canada F2 Qual | 2018/03/03 15:00 | Chang, Jonathan v Zlobinsky, Julian | 6-4,3-6,3-6 |
| ITF Canada F1 | 2018/03/01 00:00 | Chang, Jonathan v Dancevic, Frank | 2-6,6-7 |
| ITF USA F20 Qual | 2018/07/22 15:00 | Huang, Austen v Cozbinov, Alexander | 3-6,2-6 |
| ITF USA F19B Qual | 2018/07/16 17:25 | Lebedev, Alexander v Cozbinov, Alexander | 6-2,6-4 |
| ITF USA F19B Qual | 2018/07/15 15:00 | Kaster, Kaptan v Cozbinov, Alexander | 0-6,3-6 |
| ITF USA F17 Qual | 2018/06/26 15:00 | Spec, Matic v Cozbinov, Alexander | 7-6,6-4 |
| ITF USA F17 Qual | 2018/06/25 17:00 | Allen, Leighton v Cozbinov, Alexander | 3-6,6-7 |
| ITF USA F2 Qual | 2018/01/07 19:00 | Patrick Kypson v Cozbinov, Alexander | 6-4,4-6,6-4 |
| ITF USA F2 Qual | 2018/01/06 18:00 | Cozbinov, Alexander v Tristan Boyer | 7-6,4-6,6-3 |
| ITF USA F1 Qual | 2017/12/30 20:30 | Smith, Logan v Cozbinov, Alexander | 6-1,7-5 |