Stadium: Court 17 Round: 60 Ground: Hardcourt outdoor
| Challenger Columbus | 2018/09/15 17:00 | Rodriguez-Pace, Ricardo v Chang, Jonathan | 6-4,6-7,6-2 |
| ITF USA F21 | 2018/08/01 18:55 | Chang, Jonathan v Joyce, Martin | 6-2,3-6,2-6 |
| ITF USA F21 Qual | 2018/07/31 17:05 | Chang, Jonathan v Brymer, Gage | 6-4,6-2 |
| ITF USA F21 Qual | 2018/07/30 15:00 | Chang, Jonathan v Blumenberg, Alex | 6-2,6-1 |
| ITF USA F21 Qual | 2018/07/28 17:00 | Chang, Jonathan v Metz, David | 6-2,6-0 |
| 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 F25 | 2018/09/17 18:00 | Sorbo, Jonathan v Emilio Nava | 5-7,3-6 |
| ITF USA F25 | 2018/09/16 17:30 | Acosta, Felipe v Sorbo, Jonathan | 4-6,6-2,5-7 |
| ITF USA F25 | 2018/09/14 19:00 | Sorbo, Jonathan v Borges Pereira, Kevin | 6-1,1-6,6-4 |
| Canada F7, Singles | 2018/09/08 13:00 | Sorbo, Jonathan v Vukovic, Luka | 6-4,2-6,2-6 |
| ITF Canada F6 | 2018/09/01 13:00 | Ronald Hohmann v Sorbo, Jonathan | 6-3,6-3 |
| ITF USA F14 | 2018/06/09 16:00 | Kandath, Matthew v Sorbo, Jonathan | 6-4,6-4 |
| ITF USA F12 | 2018/04/20 13:00 | Bourchier, Edward v Sorbo, Jonathan | 6-0,6-2 |
| Challenger Drummondville Qual | 2018/03/11 17:45 | Sorbo, Jonathan v Huang, Chih Chi | 2-6,3-6 |