Round: 62 Ground: Hardcourt outdoor
| USA F26, Singles Qualifying | 2018/09/22 16:30 | Chang, Jonathan v Sorbo, Jonathan | 6-2,6-1 |
| USA F26, Singles Qualifying | 2018/09/22 16:30 | Chang, Jonathan v Sorbo, Jonathan | 6-2,6-1 |
| 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 |
| ITF USA F27 | 2018/10/10 19:00 | Chang, Jonathan v Ryan Peniston | 0-6,4-6 |
| ITF USA F27 | 2018/10/08 16:50 | Tim Ruehl v Chang, Jonathan | 1-6,6-7 |
| USA F26, Singles Qualifying | 2018/09/23 17:00 | Chang, Jonathan v Kelly, Robert | 2-6,2-6 |
| USA F26, Singles Qualifying | 2018/09/22 16:30 | Chang, Jonathan v Sorbo, Jonathan | 6-2,6-1 |
| 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 |