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